2008 GMC Sierra 1500 Consumer Review: Check carefully before you buy

2008 GMC Sierra 1500 - Consumer Review

Average Consumer Rating

97 Total Reviews

SLT Crew Cab Pickup (5.3L V8 4x4 4-speed Automatic 5.8 ft. Bed)

Build Quality
Reliability Value
3 of 3 people found this review helpful
Check carefully before you buy
By txcwby on


2008 GMC Sierra 1500 SLT 4dr Crew Cab 4WD 5.8 ft. SB (5.3L 8cyl 4A)


Overall, i would not buy this truck again due to repair costs.

At 104,000 miles (notice it's just outside the warranty) engine heads both cracked - with the mileage and the reported issues about oil usage and AFM related issue, it makes more sense to replace with a GM crate engine than to solve part of the problem.

Mileage on E85 is 14mpg in 2wd if you are an extremely light footed driver.
With 87 octane, the average mpg (light foot) is 18mpg-19mpg in hilly terrain.

As a cowboy and rancher, my vehicle is my lifeblood and cost of ownership and reliability is key.
This truck just hasn't met the minimum expectations.
Cost for new engine at GM dealer - $7,898.77

Best Features

Interior is well done, instrument cluster is extremely clear, and buttons are all sized for when you have gloves on.

Worst Features

Turning radius is ridiclously large. Body roll/sway when making a sharp turn at >45mph can easily feel like losing control due to length of vehicle and stiffness of frame. Oil level gauge needs to be installed - this truck will go from 'ok' to stop engine - low oi pressure without any warning - such as oil pressure PSI gauge showing reduced oil. That's great for the pump working effectively, but it's nice to know when you're getting low - and based on forum feedback, the AFM engine in this truck can burn 1 quart of oil every 3,000 miles and be considered normal by GM.
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