The LS4 engine is one of the most unique members of General Motors’ legendary LS engine family. Produced from 2005 through 2009, the LS4 was specifically designed for front-wheel-drive performance vehicles. Unlike traditional rear-wheel-drive LS engines, the LS4 featured a shortened crankshaft, modified accessories, and a compact design that allowed GM to fit a powerful 5.3L V8 into midsize front-wheel-drive sedans.
Found in vehicles such as the Chevrolet Impala SS, Pontiac Grand Prix GXP, Chevrolet Monte Carlo SS, and Buick LaCrosse Super, the LS4 became known for delivering impressive V8 performance while maintaining everyday drivability.
LS4 Engine Overview
The LS4 belongs to GM’s Generation IV small-block V8 family. Although it shares many components with the LS2 and other LS engines, the LS4 was specifically engineered for transverse front-wheel-drive applications. Engineers shortened the crankshaft by approximately 13 mm and redesigned the front accessory drive system to fit tighter engine bays.
The result was one of the most powerful front-wheel-drive V8 engines ever offered in a production sedan during its era.
LS4 Engine Specifications
LS4 Horsepower & Torque
Factory-rated output for the LS4 was 303 horsepower and 323 lb-ft of torque. While these numbers may appear modest compared to larger LS variants, the LS4 delivered exceptional performance in front-wheel-drive applications and provided strong acceleration throughout the RPM range.
Factory Output: 303 HP and 323 lb-ft of Torque
LS4 Oil Type
GM recommends high-quality synthetic engine oil for the LS4 engine. Synthetic oil provides superior protection against wear, sludge formation, and high operating temperatures.
- SAE 5W-30 Full Synthetic (Recommended)
- SAE 10W-30 for warmer climates
- High-mileage synthetic oil for older engines
LS4 Oil Capacity
The LS4 engine requires approximately 6 quarts of engine oil when changing both the oil and filter. LS-family engines generally maintain consistent oil capacities, making maintenance straightforward.
Oil Capacity: 6 Quarts (5.7 Liters)
LS4 Firing Order
1-8-7-2-6-5-4-3
Vehicles Equipped With The LS4
- 2006–2009 Chevrolet Impala SS
- 2006–2007 Chevrolet Monte Carlo SS
- 2005–2008 Pontiac Grand Prix GXP
- 2008–2009 Buick LaCrosse Super
Common LS4 Engine Problems
Active Fuel Management (AFM) Issues
Some LS4 engines can experience lifter and AFM-related problems as mileage increases.
Oil Consumption
Higher-mileage examples may develop increased oil consumption due to piston ring wear.
Transmission Stress
The 4T65-E HD transmission can become a weak point when subjected to aggressive driving or modifications.
Water Pump Leaks
Cooling system components such as water pumps may require replacement as mileage accumulates.
LS4 Reliability & Lifespan
The LS4 is generally considered a reliable engine when properly maintained. Like most LS-based engines, the bottom end is extremely durable and capable of handling substantial mileage. Many owners report well over 200,000 miles with routine oil changes and preventative maintenance.
- Typical lifespan: 200,000–300,000+ miles
- Strong cast-aluminum architecture
- Excellent aftermarket support
- Proven LS-family durability
Best LS4 Performance Upgrades
- Cold air intake system
- Long-tube headers
- Performance exhaust
- ECU tuning
- Upgraded camshaft
- AFM delete kit
- Higher-flow fuel injectors
- Improved ignition components
Oil Change Cost
Frequently Asked Questions
How much horsepower does an LS4 make?
The LS4 produces 303 horsepower and 323 lb-ft of torque from the factory.
What oil does the LS4 use?
GM generally recommends SAE 5W-30 synthetic engine oil.
How much oil does an LS4 hold?
The LS4 requires approximately 6 quarts of oil including the filter.
Is the LS4 reliable?
Yes. The LS4 is considered a durable LS-family engine capable of exceeding 200,000 miles with proper maintenance.
What is the LS4 firing order?
The LS4 firing order is 1-8-7-2-6-5-4-3.
Final Thoughts
The LS4 remains one of the most interesting engines in the LS family. Its unique front-wheel-drive design, strong performance, and proven durability make it a favorite among GM enthusiasts. While it may not receive as much attention as the LS1, LS2, or LS3, the LS4 continues to offer excellent performance, reliability, and modification potential for owners who appreciate its unique engineering.