The 2010-2014 GM 5.3L V8 (LC9, LMG, LH6) has a documented and class-action-confirmed oil consumption defect. Owners report burning a quart of oil every 1,000 miles, and the Sloan v. GM settlement covered eligible trucks for piston ring and AFM pressure relief valve repairs.
Confirmed class-action defect (Sloan v. GM, settled). Excessive oil consumption is a near-certainty on high-mileage 2010-2014 5.3L trucks. Repair costs range from $1,500 to $5,000+.
The factory piston rings have insufficient tension and the oil drain holes in the pistons are inadequate. Result: oil enters the combustion chamber and burns. The proper fix is a full short-block ring redesign.
View P0171 Diagnosis →The AFM PRV in the valley sprays oil onto the bottom of the #1 piston, fouling the rings and accelerating consumption. Cheap to fix, often the first thing to address.
View P0521 Diagnosis →A worn PCV orifice in the valley cover allows the intake to suck oil out of the crankcase. Often shows up as a slick intake manifold and dripping throttle body.
View P0496 Diagnosis →Same lifter failure pattern as the later L83. Once oil consumption gets bad, lifter starvation and collapse usually follow.
View P0301 Diagnosis →Oil-fouled plugs cause misfires and rough running. Replacing plugs without addressing the root cause is just a temporary fix.
View P0300 Diagnosis →Run a free AI diagnosis tailored to your exact vehicle. Get the most likely cause and repair estimate in under 30 seconds.
Run a Free Diagnosis on My 5.3L100% free · No signup needed · Powered by NHTSA + AI
2010-2014 GM trucks and SUVs with 5.3L LC9, LMG, or LH6 engines and Active Fuel Management.
Pre-2010 5.3L (without aggressive AFM tuning), or 2015+ trucks (which moved to the L83 - different problems but typically less consumption). Best of all: an LS-swap with a non-AFM truck engine.
Beyond normal maintenance, plan on $1,500-$2,000 for the AFM PRV/PCV fix, and $3,000-$5,000 for piston rings if consumption is severe. Many owners simply add oil between changes - 1qt per 1,000 miles costs about $40 a year in oil.
If your 5.3L is throwing a check engine light, these are the codes most often associated with the problems above. Click any code for full diagnosis steps and typical repair costs.
Typical reports are 1 quart every 1,000-2,000 miles. Severely affected engines burn 1 quart every 500-700 miles - bad enough to foul plugs and trigger misfire codes.
Yes. Sloan v. General Motors covered 2011-2014 GM trucks and SUVs with the 5.3L V8. The settlement covered piston ring and AFM PRV repairs for eligible owners. Most claim windows have closed.
A full piston-ring replacement with redesigned rings, plus AFM PRV and PCV repair. Cost runs $3,000-$5,000 at a shop. Some owners do an AFM delete at the same time.
No - additives like high-mileage oil or stop-leak products do not address the root cause (low-tension rings and PRV oil spray). They might mask a small leak briefly.
5.3L LC9 (flex-fuel), LMG (gasoline), and LH6 (earlier variant) in 2010-2014 Silverado, Sierra, Tahoe, Suburban, Yukon, and Avalanche.