The Chevrolet LZ8 is a 3,900 cc, V6 gasoline engine produced between 2007 and 2011. It features a 60 — degree overhead valve (OHV) design with variable valve timing (VVT) and sequential fuel injection. Designed for light — duty trucks and SUVs, it delivers 211 kW (285 PS) and 373 Nm of torque, providing strong mid — range performance for daily driving and towing applications.
Fitted to models such as the Chevrolet TrailBlazer, GMC Envoy XL, and Saab 9 — 7X, the LZ8 was engineered…
Chevrolet
Production years 2007–2009 meet U.S. Tier 2 Bin 5 and Euro 4 standards; 2010–2011 models comply with enhanced evaporative emissions requirements (EPA Doc. EPA-HQ-OAR-2005-0075).
The Chevrolet LZ8 is a 3,900 cc V6 gasoline engine engineered for full-size SUVs and trucks (2007-2011). It combines a compact 60° OHV architecture with variable valve timing to deliver responsive mid-range torque and smooth operation. Designed to meet U.S. Tier 2 and Euro 4 emissions standards, it balances performance with everyday drivability.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,900 cc | |
Fuel type | Gasoline | |
Configuration | 60° V6, OHV, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 100.0 mm × 82.0 mm | |
Power output | 211 kW (285 PS) @ 5,600 rpm | |
Torque | 373 Nm @ 4,400 rpm | |
Fuel system | Sequential port fuel injection (SFI) | |
Emissions standard | U.S. Tier 2 Bin 5 / Euro 4 | |
Compression ratio | 10.1:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double roller chain (cam-to-crank) | |
Oil type | GM Dexos1 5W-30 | |
Dry weight | 185 kg |
The Chevrolet LZ8 was used across GM's GMT360 platform with longitudinal mounting and shared with Saab and Isuzu under corporate partnerships. This engine received platform-specific calibrations-adapted throttle response in the TrailBlazer SS and revised torque curves in the Saab 9-7X Aero-and from 2009 received updated IMRC actuators, creating interchange limits. Partnerships allowed Saab to badge the LZ8 as the "V6 3.9i" in North American markets. All adaptations are documented in OEM technical bulletins.
The LZ8's primary reliability risk is intake manifold runner control (IMRC) actuator failure, with elevated incidence in high-heat climates and stop-start driving. GM internal field reports from 2010 indicated over 15% of pre-2009 units required IMRC service before 160,000 km, while NHTSA data links a notable share of P2015 DTCs to this issue. Extended oil intervals and ethanol-blended fuels increase VVT and actuator wear, making fluid quality and maintenance adherence critical.
Analysis derived from GM technical bulletins (2007-2011) and NHTSA field reports (2008-2013). Repair procedures should follow manufacturer guidelines.
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The LZ8 is generally robust with proper maintenance, but pre-2009 models are prone to IMRC actuator failure. Later revisions improved actuator durability. Engines maintained with GM Dexos1 oil and regular service intervals can exceed 240,000 km. Avoid ethanol blends above E10 to protect fuel system components.
The most frequent issues are IMRC actuator gear wear, VVT phaser rattle on cold start, coolant leaks from intake manifold gaskets, and throttle body motor failure. These are documented in GM service bulletins and NHTSA filings. Carbon buildup on intake valves is also common in short-trip driving cycles.
The LZ8 was primarily used in the Chevrolet TrailBlazer (2007-2009), including the TrailBlazer SS performance variant. It was also available in the GMC Envoy XL, Saab 9-7X, and Isuzu Ascender. All applications were on the GMT360 platform with longitudinal engine mounting.
Yes, the LZ8 responds well to ECU tuning. Stage 1 remaps typically yield +20-25 kW by optimizing throttle response and shift points. Cold air intakes and exhaust upgrades provide modest gains. However, the OHV design limits high-RPM potential, so forced induction requires significant internal modifications.
In combined driving, the LZ8 averages 13.0–14.5 L/100km (19–20 mpg UK). Highway driving can achieve ~10.0 L/100km (28 mpg UK), while city driving may exceed 16.0 L/100km (18 mpg UK). Real-world consumption depends heavily on vehicle weight, driving style, and terrain.
No. The LZ8 uses a non-interference valvetrain design. If the timing chain fails, the pistons will not contact the valves, preventing catastrophic engine damage. However, immediate repair is still required to avoid misfires and secondary damage.
GM specifies Dexos1 5W-30 synthetic blend or full synthetic oil. Change intervals should not exceed 15,000 km or one year. Using correct oil ensures proper VVT phaser operation and prevents premature chain and bearing wear. Aftermarket additives are not recommended.
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