GM’s LS engines, from the 4.8 and 5.3 truck engines to the 6.0 Vortec and the LS1, LS2 and LS3 car engines, have a reputation for durability, and a well-maintained LS commonly runs 200,000 miles or more. Truck versions with iron blocks often go 250,000 to 300,000 miles with good care. The LS design’s simple pushrod valvetrain and strong bottom end are a big part of that; what shortens their life is mostly neglected oil changes, overheating and, on some versions, cylinder deactivation lifter failures.
LS engine life by family
| Engine | Common use | Watch for |
|---|---|---|
| LS1 (5.7) | C5 Corvette, Camaro, Firebird, GTO | Piston slap when cold, oil consumption on some, rear main seal leaks |
| LS3 (6.2) | C6 Corvette, Camaro SS | Valve spring and lifter wear in hard use, oil consumption on some |
| 5.3 truck engines | Silverado, Sierra, Tahoe | Cylinder deactivation lifters, oil consumption on some years |
| 6.0 Vortec | Heavy-duty trucks and vans | Knock sensors, intake gaskets, exhaust manifold bolts |
See LS1 problems, 5.3 Vortec problems, 6.0 Vortec problems and LS engine specs.
Are LS3 engines reliable?
Yes, in normal use. The LS3 is generally regarded as a durable performance engine. Hard track use, high rpm and added boost put more stress on valve springs, lifters and bearings, so those builds need closer attention to oil temperature, oil level and valvetrain condition.
What makes an LS last
- Oil changes on schedule with the grade GM specifies, and keeping the level full; some engines use oil between changes.
- A healthy cooling system; see engine overheating.
- Fixing lifter tick early on engines with cylinder deactivation; see lifter tick.
- Matching fuel, boost and timing on modified engines to the parts installed.
Supercharged LS engines
A supercharger kit sized for a healthy engine and installed with the supporting parts the kit maker specifies can live a long time, but added boost reduces the margin for error. See is a supercharger worth it?, LS3 supercharger kits and LS1 supercharger kits.
Signs an LS is wearing out
- Rising oil consumption and blue smoke.
- Lifter tick or knocking that does not go away when warm.
- Low or uneven compression; see compression test.
Replacement LS engines we list
We list LS-based 5.3 and 6.0 truck engines, such as the Chevy 5.3L V8 Engine 2010-2014 ($4,599.00) and the Chevy 6.0L Vortec 6000 V8 Engine 2001-2007 ($3,799.00). Browse LS engines and see LS swap guide.
More guides: how long an LT1 lasts · how long a 6.0 Vortec lasts.
Shipping is a flat $80.00 per order to US addresses, with 15-day free returns. Questions? Ask a parts specialist.