The 4.2-liter General Motors LL8 engine was produced at the Michigan plant from 2001 to 2008 and was installed on GMT360 platform models such as the Chevrolet TrailBlazer, GMC Envoy, Saab 9-7X. This inline 6-cylinder engine is highly reliable, but its consumption is high.
The Atlas family: LLV, LLR, LL8.
Specifications
| Production years | 2001-2008 |
| Displacement, cc | 4157 |
| Fuel system | distributed injection |
| Power output, hp | 270 – 295 |
| Torque output, Nm | 373 – 376 |
| Cylinder block | aluminum R6 |
| Block head | aluminum 24v |
| Cylinder bore, mm | 93 |
| Piston stroke, mm | 102 |
| Compression ratio | 10.0 – 10.3 |
| Features | DOHC |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | at the exhaust |
| Turbocharging | no |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 6.6 |
| Fuel type | petrol |
| Euro standards | EURO 2/3 |
| Fuel consumption, L/100 km (for GMC Envoy 2005) — city — highway — combined |
17.9 10.1 13.0 |
| Engine lifespan, km | ~400 000 |
| Weight, kg | 215 |
The engine was installed on:
- Buick Rainier 1 (GMT360) in 2003 – 2007;
- Chevrolet Trailblazer 1 (GMT360) in 2001 – 2008;
- GMC Envoy 2 (GMT360) in 2001 – 2008;
- Isuzu Ascender 1 (GMT360) in 2002 – 2008;
- Oldsmobile Bravada 3 (GMT360) in 2001 – 2004;
- Saab 9-7X 1 (GMT360) in 2004 – 2008.
Disadvantages of the GM LL8 engine
- Motors of the very first year of production fell into a recall campaign due to subsidence of sleeves.
- Otherwise, it is a fairly reliable unit, but not everyone will like its consumption.
- After 200,000 km, you may experience valve seat wear and chain stretching.
- The viscous coupling of the fan serves relatively little, and the engine is afraid of overheating.
- The weak points also include the exhaust manifold, very often it cracks.
