Skip to FiltersReport abuse
129 listings
$2,950great price$1,882 Below Market224,288 milesNo accidents, 2 Owners, Personal use6cyl AutomaticWoodbridge Public Auto Auction (Woodbridge, VA)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Woodbridge, VA / 28 miles away from Ashburn, VA
KEY FEATURES AND OPTIONS Comes equipped with: Rear Air Conditioning, Bluetooth, Front Heated Seats. This Lexus GS 300 also includes Power Driver's Sea...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S060020842
Stock: 134198
Certified Pre-Owned: No
Listed since: 04-06-2023
$9,995good price$2,043 Below Market81,033 milesNo accidents, 4 Owners, Personal use only6cyl AutomaticNext Ride Auto Sales (Tampa, FL)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Tampa, FL / 812 miles away from Ashburn, VA
AWESOME FLORIDA NO ACCIDENT NO SMOKER 2006 LEXUS SC300 AWD, SUNROOF, NAVIGATION, BACKUP CAMERA, BLUETOOTH, RED WITH COOLED/HEATED BLACK LEATHER AND WO...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S260010572
Stock: 1031231
Certified Pre-Owned: No- New Listing
$12,999fair price$321 Above Market53,231 milesNo accidents, 2 Owners, Personal use only6cyl AutomaticAutobahn Motors (Belmont, CA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Belmont, CA / 2,406 miles away from Ashburn, VA
Only 53,231 Miles! Scores 30 Highway MPG and 22 City MPG! This Lexus GS 300 delivers a Gas V6 3.0L/183 engine powering this Automatic transmission. Wo...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S565010662
Stock: S65010662
Certified Pre-Owned: No
Listed since: 11-26-2023 
$8,974good price$1,323 Below Market115,255 miles1 Accident, 2 Owners, Personal use only6cyl AutomaticPrize Auto (Waldorf, MD)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Waldorf, MD / 42 miles away from Ashburn, VA
Prices do not include additional fees and cost of closing, to include government fees, taxes, titling, tags, destination charges, any finance charges,...
AutoCheck Vehicle History Summary
Accident Free Vehicle: No
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S365001880
Stock: 231311
Certified Pre-Owned: No
$10,995118,356 milesNo accidents, 2 Owners, Personal use only6cyl AutomaticJohn's Auto Sales (Somerville, MA)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Somerville, MA / 407 miles away from Ashburn, VA
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S660010073
Stock: 010073
Certified Pre-Owned: No
154,941 milesTitle issue reported, 5 Owners, Personal use only6cyl AutomaticVirginia Auto Trader Co (Arlington, VA)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Arlington, VA / 23 miles away from Ashburn, VA
2006 LEXUS GS 300 AWD with powerful 3.0L DOHC 24-valve V6 -inc dual continuously engine and driven only 154941 miles! Fully loaded and much more! CARF...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Title issue reported
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S160011258
Stock: 2261
Certified Pre-Owned: No- Price Drop
233,768 milesNo accidents, 2 Owners, Personal use only6cyl AutomaticTemecula Valley Lexus (Temecula, CA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Temecula, CA / 2,224 miles away from Ashburn, VA
Grand Opening Event ! 300 Clean CARFAX. RWD 4D Sedan 6-Speed Automatic Electronic with Overdrive and ECT-i 3.0L 6-Cylinder DOHC 24V22/30 City/Highway ...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S965027268
Stock: T01610L
Certified Pre-Owned: No
Listed since: 10-19-2023 
$13,49570,251 milesNo accidents, 2 Owners, Personal use only6cyl AutomaticLexus of Palm Beach (West Palm Beach, FL)- Leather Seats
- Sunroof/Moonroof
- Power Driver Seat
- Multi-Zone Climate C...
- Auto Climate Control
Close
Located in West Palm Beach, FL / 865 miles away from Ashburn, VA
The following items have been reconditioned on this vehicle: new brakes! Leather Trim Pkg Sun/Moonroof Leather Seats Trunk Mat Wheel Locks Cargo Ne...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
19 Combined MPG (16 City/23 Highway)
Listing Information:
VIN: JT8BD69S630181631
Stock: 30181631
Certified Pre-Owned: No
Listed since: 11-10-2023- New Listing
195,334 milesNo accidents, 7 Owners, Personal use only6cyl AutomaticTony Divino Toyota (Riverdale, UT)- Keyless Entry
- Heated Mirrors
- Power Passenger Seat
- Security System
- Multi-Zone A/C
Close
Located in Riverdale, UT / 1,818 miles away from Ashburn, VA
Only 195,334 Miles! Scores 25 Highway MPG and 20 City MPG! This Lexus GS 300 Luxury Perform Sdn boasts a Gas I6 3.0L/183 engine powering this Automati...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
20 Combined MPG (18 City/23 Highway)
Listing Information:
VIN: JT8BD68S8X0076287
Stock: 240160A2
Certified Pre-Owned: No
Listed since: 11-29-2023 
$6,995great price$2,432 Below Market132,948 milesNo accidents, 2 Owners, Personal use6cyl AutomaticRides Unlimited Chicago (Crest Hill, IL)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Crest Hill, IL / 587 miles away from Ashburn, VA
Rides Unlimited Chicago has been family owned and operated since 2013 serving Will county and beyond. At Rides Unlimited Chicago we have a laid back a...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96SX60018001
Stock: 018001
Certified Pre-Owned: No
Listed since: 10-12-2023
$4,995good price$930 Below Market229,100 milesNo accidents, 3 Owners, Personal use6cyl AutomaticMNI Auto Sales LLC (San Diego, CA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in San Diego, CA / 2,240 miles away from Ashburn, VA
2006 Lexus GS 300 229,100 MILES!!! Clean Title!!! Smog Done. Inside and out clean. Good condition. Drives great and smooth. Engine and tranny are grea...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S065028518
Stock: 028518
Certified Pre-Owned: No
Listed since: 11-02-2023- Price Drop
$5,999great price$1,357 Below Market174,105 miles1 Accident, 3 Owners, Corporate fleet vehicle6cyl AutomaticOne Stop Motors (Denver, CO)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Denver, CO / 1,464 miles away from Ashburn, VA
** SE HABLA ESPA OL ** CASH ONLY ** Sale Price excludes Dealer Fee of $399, License, Emission, and Registration Fees **
AutoCheck Vehicle History Summary
Accident Free Vehicle: No
Personal Use Only: No
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S260014640
Stock: 014640
Certified Pre-Owned: No
Listed since: 06-16-2023 
$9,480fair price$1,376 Below Market100,524 milesNo accidents, 1 Owner, Personal use only6cyl AutomaticAce Auto Group (Van Nuys, CA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Van Nuys, CA / 2,277 miles away from Ashburn, VA
*DON'T PAY FOR EXTRA AND UNNECESSARY CHARGES,, PRICE + TAX + LICENCE + REGISTRATON,,,EZ FINANCING WITH LOW RATES, BAD CREDIT OR TIN NUMBERS ARE WELCOM...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S565033469
Stock: 033469
Certified Pre-Owned: No
Listed since: 10-26-2023- New Listing
$7,990fair price$1,164 Below Market145,007 milesNo accidents, 2 Owners, Personal use only6cyl AutomaticHigh Line Motors (Irvine, CA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Irvine, CA / 2,257 miles away from Ashburn, VA
Year: 2006 Make: Lexus Model: GS 300 Miles:145,007 Engine Size: 3.0-L V-6 VIN: JTHBH96S765026085 Transmission: Automatic Exterior Color: Black Interio...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S765026085
Stock: 026085
Certified Pre-Owned: No
Listed since: 10-24-2023 
$7,495good price$1,608 Below Market146,329 miles1 Accident, 3 Owners, Personal use only6cyl AutomaticChase Auto Credit (Oklahoma City, OK)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Oklahoma City, OK / 1,130 miles away from Ashburn, VA
Auto Place Credit Sales 4309 NW 39th St Unit B Oklahoma City, OK 73112 4**-7**-8*** * STOP and SAVE! * This is a deal you can t afford to miss! * * Dr...
AutoCheck Vehicle History Summary
Accident Free Vehicle: No
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S365020767
Stock: 23A1031
Certified Pre-Owned: No
Listed since: 08-29-2023
$6,993great price$1,568 Below Market149,452 miles2 Accidents, 1 Owner, Personal use only6cyl AutomaticNations Best Autos (Decatur, GA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Decatur, GA / 523 miles away from Ashburn, VA
1 OWNER, GS 300, LEATHER, SUNROOF, PUSH START, ALLOY WHEELS, HEATED SEATS, COOLED SEATS, DRIVES GREAT ONLY 149K MILES, THIS IS A GIVEAWAY AT $699...
AutoCheck Vehicle History Summary
Accident Free Vehicle: No
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S865029500
Stock: 029500
Certified Pre-Owned: No
Listed since: 11-03-2023
$6,499fair price$754 Below Market194,516 milesNo accidents, 4 Owners, Corporate fleet vehicle6cyl AutomaticMulti Group Automotive (Doraville, GA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Doraville, GA / 515 miles away from Ashburn, VA
2006 Lexus GS 300 V6 3.0L 194k Miles Clean title, No Accidents! Runs and drives great! Financing Available! Extended Warranty Available! New Tires a...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: No
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S265031064
Stock: 031064
Certified Pre-Owned: No
Listed since: 10-09-2023
$7,985fair price$750 Below Market149,037 milesNo accidents, 6 Owners, Personal use only6cyl AutomaticInternational Cars Co (Murfreesboro, TN)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Murfreesboro, TN / 537 miles away from Ashburn, VA
Call today at Office 6**-8**-2*** Cell 6**-9**-5*** or visit us at www.internationalcarsco.comThis 2006 LEXUS GS 300 4D SEDAN features a 3.0L V6 . It ...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S760015511
Stock: 113220223
Certified Pre-Owned: No
Listed since: 11-15-2023
$4,995good price$550 Below Market221,672 miles1 Accident, 1 Owner, Personal use6cyl AutomaticFredericksburg Public Auto Auction (Fredericksburg, VA)- AWD/4WD
- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
Close
Located in Fredericksburg, VA / 48 miles away from Ashburn, VA
ONE OWNER! 36 SERVICE RECORDS. FULLY LOADED.
AutoCheck Vehicle History Summary
Accident Free Vehicle: No
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
21 Combined MPG (19 City/25 Highway)
Listing Information:
VIN: JTHCH96S960004204
Stock: 004204
Certified Pre-Owned: No
Listed since: 04-01-2023
$7,040fair price$1,113 Below Market141,280 milesNo accidents, 4 Owners, Personal use6cyl AutomaticMullen Auto Sales - Fontana (Fontana, CA)- Heated seats
- Leather Seats
- Sunroof/Moonroof
- Power Driver Seat
- Multi-Zone Climate C...
Close
Located in Fontana, CA / 2,225 miles away from Ashburn, VA
Quality Pre-Owned Vehicles in Fontana CAIf you're in the market for a used car, you've come to the right place. We have a selection of used sedans, SU...
AutoCheck Vehicle History Summary
Accident Free Vehicle: Yes
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
19 Combined MPG (16 City/23 Highway)
Listing Information:
VIN: JT8BD69S230191234
Stock: 30191234
Certified Pre-Owned: No
Listed since: 11-10-2023
$9,299good price$1,722 Below Market96,393 miles1 Accident, 2 Owners, Personal use only6cyl AutomaticBahia Auto Sales (Chesapeake, VA)- Bluetooth
- Leather Seats
- Upgraded Headlights
- Power Driver Seat
- Tire Pressure Warnin...
Close
Located in Chesapeake, VA / 169 miles away from Ashburn, VA
2006 Lexus GS-300 96k Original Miles $9299 Cash Price 3.0L 6 Cylinder Motor, Automatic Transmission RWD New State Inspection No issues with Engine or ...
AutoCheck Vehicle History Summary
Accident Free Vehicle: No
Personal Use Only: Yes
History Provider: AutoCheck
Title Details: Clean Title
Salvage Vehicle: No
Frame Damage: No
Theft History: No
Lemon Status: No
Free History Report: No
Features and Specs:
22 Combined MPG (19 City/27 Highway)
Listing Information:
VIN: JTHBH96S865022868
Stock: 11785
Certified Pre-Owned: No
Listed since: 09-22-2023
Consumer Reviews for the Lexus GS 300
Read recent reviews for the Lexus GS 300
Favorite car I have ever owned
SoontobeRN, 10/13/2015
2006 Lexus GS 300
First, I have had over 20 different vehicles, but this is my first "luxury" vehicle, so I cannot compare this car to other luxury vehicles. Having said that, I have no reason whatsoever to want to drive any other type of car but a Lexus. I am a full time nursing student and commute at least 2 hours a day depending on clinical location, so comfort and fuel economy is at the top of my … "car" priority list. This car meets all of my standards and then some. It is so smooth and comfortable, it almost drives itself. I also have a Challenger R/T so if I have a need to "feel the road" I drive it, but I choose to drive this car 95% of the time due to its comfort, excellent gas mileage (I consistently get 30 mpg highway or more, long trips I get around 33.9 avg) ease in driving, acceleration, and classy looks. I will try to break down some pro's and con's for those of you who are considering one.
Pro's: Beautiful looks, plenty of leg room (my husband is 6'3" and fits comfortably) well crafted interior, VERY comfortable ride, great acceleration, excellent gas mileage, decent technology (car is 9 years old!), CASSETTE player for those of us who grew up in the '80's and still have a few tapes, great exterior lighting for entry/exit of vehicle, high safety rating, sport mode, and many more pro's that I am probably forgetting. My favorite car before this one was a Nissan Maxima, and it does not hold a candle to this Lexus. I HIGHLY RECOMMEND THIS CAR to anyone who likes a soft, powerful ride and great gas mileage combined with good looks. Last but certainly not least, Lexus customer service is second to none. There was a recall on this model earlier this year. I went online to Lexus.com and scheduled the maintenance, easy - peasey. I took the car (that I did not buy from them) to Butler Lexus in Macon, GA for the servicing. Not only did they give me a brand new Lexus RX350 SUV to drive for two days, when I went to pick up my car, it was clean and full of premium gas- for FREE. I didn't pay a dime for the recall, the carwash/ vacuum, or the gas. Each time I have taken it in for servicing they always wash it and vacuum it, so yeah, I will be buying another Lexus.
Con's: Not very many, but here are a few: Lacklustre sound system - however, I love rock and roll and like to crank it up, so this may not be an issue for you (Mine does not have the Mark Levinson), unreliable bluetooth (but at least it HAS bluetooth- it is almost 10 years old!) an annoying thing where the rear view mirrors tilt down in reverse and then won't go back to the preset position- you can turn this feature off but it is easily reactivated, so it gets annoying sometimes, NO TRUNK OR HOOD LIGHT!!!- why????, and a very common issue with these cars is a cold start rattling sound. I have heard this is a crank shaft pulley or something of the sort that costs around $1,600, so I will live with the noise for awhile. The lowbeam lights are ridiculously dim and you can barely see the road at night if it does not have prominent yellow markings. That great gas mileage I referred to comes at a "premium"- the car requires premium fuel. This was not an issue for me; I always use premium, but for those of you who like to use 87 Octane, this might be an issue.
That's about it. My car is an '06, Crystal White with tan interior, with 159,000 miles on it. I get MANY compliments on this car and people think it is much newer than it is. I love it and will almost certainly buy a newer version of it when I am finished with nursing school.
I hope this helps!
More about the Lexus GS 300
Edmunds has 129 Used Lexus GS 300s for sale near you, including a 2006 GS 300 Sedan and a 2003 GS 300 Sedan ranging in price from $2,950 to $13,495.
How much is the used Lexus GS 300?
- There are 129 used Lexus GS 300 vehicles for sale near you, with an average cost of $8,005.Edmunds found one or more Great deals on a used Lexus GS 300 near you, starting at $2,950.That's $5,055 less than the average price of a used GS 300 near you. Learn more about the Lexus GS 300
Is the used Lexus GS 300 a good car?
- The used Lexus GS 300 received an average score of 4.7 out of 5 based on 512 consumer reviews at Edmunds. If you want to learn more about the Lexus GS 300, read Edmunds' expert review. Learn more about the Lexus GS 300