Adding Oil...Again - 2005 Mercedes-Benz CL65 AMG Long-Term Road Test

2005 Mercedes-Benz CL65 AMG Long-Term Road Test

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2005 Mercedes-Benz CL65 AMG: Adding Oil...Again

April 14, 2014

2005 Mercedes-Benz CL65 AMG

Our twin-turbo V12-powered long-term 2005 Mercedes-Benz CL65 AMG is using oil. About a quart every 1,000 miles.

We bought the car back in December with 56,000 miles on it. It was a CPO car and had just been serviced by Mercedes-Benz of Reno, NV. However, we've already added oil to the big V12 four times: a quart at 58,500 miles, 59,000 miles, 61,000 miles and now at 62,000 miles. Per the car's spec we used Mobil 1 0W40 full synthetic European Car Formula, which ain't cheap.

2005 Mercedes-Benz CL65 AMG

There doesn't seem to be any leaks under the car and we have no way to manually check the oil level. Remember, this Mercedes does not have a dipstick. Instead it relies on a digital computer-generated oil level gauge and low level warning system. It is possible that measuring system is on the fritz and we are overfilling the engine, which would not be good, but I don't believe that to be the case.

Meanwhile, that same computer tells us a scheduled service should be performed in 4,500 miles. We'll keep you posted.

Scott Oldham, Editor in Chief @ 61,185 miles


  • throwback throwback Posts:

    is the V12 knonw for using oil? This seems excessive even for a rotary! Former Rx-7 owner here.

  • gtulley gtulley Posts:

    There has to be something wrong with the sensor. My oil level hasnt budged in 4000 miles.

  • greenpony greenpony Posts:

    "Remember, this Mercedes does not have a dipstick." . . . . Except the driver! ;)

  • miata52 miata52 Posts:

    Definitely a lot of oil for a 4 or 6 banger, but maybe the 12 burns a lot more. Anybody know?

  • gtulley gtulley Posts:

    Did they check the level, which has to be done with the engine off, instead of taking a pic while doing 60mph somewhere potentially getting a bogus message?? This engine does not burn that amount of oil. Something is amiss.

  • mercedesfan mercedesfan Posts:

    I wrote this in the last oil post, but these early M275-equipped AMGs burn a LOT of oil. Owner forums report standard consumption of about 1 quart every 1500 miles.

  • diigii diigii Posts:

    Not only is it a gaz guzzler, but an oil guzzler too.

  • mieden mieden Posts:

    This thing is drinking a LOT of oil. Ive seen M275s consume a qt every 2-3K, but this does seem excessive. Ive heard of them drinking this much, just never seen it. A 16-year-old must have broken this motor in...

  • ayao ayao Posts:

    FYI you can get a 5 quart jug of the M1 0W-40 at Wal-Mart for < $30, the same cost as all the other M1 grades.

  • "Remember, this Mercedes does not have a dipstick." . . . . Except the driver! ;) Correction: "Remember, this Mercedes does not have a dipstick." . . . . Except the OWNER!" :)

  • gtulley gtulley Posts:

    Surprised they haven't drained it and measured the amount...sounds like a fun project for the crew.

  • gslippy gslippy Posts:

    The dealer will inevitably tell you this sort of oil consumption is normal. The VW dealer told me the same thing when my 02 30V V6 Passat was burning oil every 1000 miles, and it only had 30k on it. You're out of luck. Who builds an engine without a dipstick? If you blow it up due to overfilling, M-B won't help you.

  • barich1 barich1 Posts:

    At this rate, why even bother changing the oil, just change the filter occasionally.

  • Upon reading this, I just thought to myself how a private purchaser would deal with this? "Car drinks oil at a near-incredible rate, but maybe some expensive sensor is the problem and I'm drowning my crankcase in oil. And I already have spent a bunch of money on the hydraulic and other symptoms, and I've put 6,000 miles on it. Oh, and this one came from the Mercedes dealer, not some fly-by-night or a private seller trying to unload it." I don't know if it would be yet, but at some point not far off I'd envision a private owner dumping the car.

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