Maintaining your 2008 Chevrolet Impala with the 3.9L V6 engine requires precise lubrication to ensure longevity and performance. This vehicle was designed with specific fluid capacities and synthetic formulations in mind to handle the demands of daily driving, extreme weather, and heavy load conditions. Using the wrong viscosity or mixing incompatible fluids can lead to premature wear, reduced fuel economy, and costly repairs. Proper maintenance ensures that critical components like the engine, transmission, and cooling system operate within their optimal parameters.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Provides unsurpassed engine protection for up to 25,000 miles or one year. This oil offers 75% more protection against horsepower loss and wear, making it the ideal choice for owners seeking maximum performance.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Delivers extended-life protection for up to 20,000 miles. It features 37% more cleaning power than the OE line to help keep the engine running smoother and longer while protecting against low-speed pre-ignition (LSPI).
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective synthetic option that outperforms conventional oils. It fights sludge and deposits with a robust 100% synthetic formulation and protects turbochargers effectively.
- AMSOIL Oil Filter – Engineered with premium media to provide 99% filtering efficiency at 20 microns. It allows lower restriction to keep engine parts lubricated and offers greater capacity for small, wear-causing contaminants than competing filters.
- WIX XP Oil Filter – A high-performance alternative featuring premium media that offers improvements over original equipment manufacturer-branded filters for those who prefer the WIX brand.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Withstands the rigors of heavy towing, elevated temperatures, and challenging terrain. It remains fluid in sub-zero temperatures and provides reserve protection during heavy use and abuse.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A reliable OE-recommended fluid that protects against wear and offers fuel efficiency in the 4T65-E transmission common in this model.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid (OAT) formulation that provides protection up to 150,000 miles or 5 years. It is a 50/50 pre-mix that protects all cooling system metals, gaskets, and hoses.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – A concentrated non-toxic coolant that requires mixing. It offers protection up to 150,000 miles or 5 years and is highly effective against corrosion and erosion.
- WIX Transmission Filter – Designed for the automatic transmission to work in tandem with AMSOIL transmission fluid, ensuring optimal filtration and performance.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Features excellent ABS and traction-control responsiveness with a stable viscosity over a wide temperature range, ensuring consistent braking performance.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Reduces friction and helps seals remain soft to prevent leaks. It resists heat for long fluid life and provides excellent high-temperature protection for quiet operation.
Engine Oil Specifications and Capacities
The heart of the 2008 Chevrolet Impala, specifically the 3.9L 6-cylinder engine (Engine Code [3] LZG 3 Flex), requires a specific oil capacity and viscosity to function correctly. When performing an oil change, the total fluid capacity is 5.1 quarts when the filter is replaced. This capacity accounts for the additional oil needed to saturate the new filter and fill the oil galleries. For those changing the filter, it is crucial to ensure the oil level is checked after the refill to avoid under-filling or over-filling the engine.
AMSOIL offers three distinct lines of 5W-30 motor oil that meet the requirements for this engine. The Signature Series stands out for drivers who want the absolute best protection. It provides up to 25,000 miles of guaranteed protection between changes. This level of extended drain capability reduces the frequency of maintenance visits and minimizes waste. The oil contains a proprietary additive package designed to fight sludge, which is particularly beneficial for vehicles that see stop-and-go driving or short trips where engines do not fully warm up.
The Extended-Life 5W-30 is another robust option, offering up to 20,000 miles of protection. This formulation is engineered with 37% more cleaning power than the OE version, which helps keep the engine running smoother for longer. It is an excellent choice for drivers who want a balance of extended service intervals and superior cleaning properties without the premium price tag of the Signature Series.
For those looking for an oil that outperforms conventional oils while meeting original equipment manufacturer (OEM) mileages, the OE 5W-30 is a standout choice. It uses 100% synthetic base stocks to fight sludge and deposits effectively. Despite being the value option among AMSOIL’s offerings, it provides full synthetic protection and is trusted by professional engine builders. All three oils are 100% synthetic, ensuring excellent flow in cold temperatures and stable viscosity in high heat, which protects the engine from the wear-causing conditions of thermal breakdown.
Complete Lubrication Guide: Filters and Fluids
A complete service extends beyond just the engine oil. The 2008 Impala’s automatic transmission, the 4T65-E, requires specific fluid and filtration to maintain smooth shifting and prevent internal wear. The transmission fluid capacity varies depending on the service being performed. A total fill requires 13.4 quarts, while an initial fill after a rebuild or significant repair is 7.4 quarts. For routine maintenance fluid changes, users should refer to their dipstick or service manual for the correct amount, typically much less than a full fill.
Using a high-quality automatic transmission fluid is critical for this transmission type. AMSOIL’s Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid is formulated to withstand the rigors of heavy towing and elevated temperatures. It remains fluid in sub-zero conditions, ensuring quick lubrication upon startup. The OE Fuel-Efficient version offers similar protection for those following more traditional service intervals. Both fluids are designed to provide excellent protection against wear and sludge formation in the transmission system.
Filtration is equally important. The WIX Transmission Filter ensures that contaminants are removed from the transmission fluid, preventing them from causing damage to the valve body and clutches. Just as with the engine, the oil filter choice plays a significant role in engine longevity. The AMSOIL Oil Filter is designed with high-capacity media to trap small wear-causing contaminants, reducing engine wear. For those preferring the WIX brand, the WIX Oil Filter and WIX XP Oil Filter provide premium media options that improve upon standard OEM filters, ensuring clean oil reaches all critical engine components.
Cooling system maintenance is vital for the longevity of the Impala’s engine. The cooling system capacity is substantial, holding 10.1 quarts of coolant. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is a 50/50 pre-mix that protects the cooling system for up to 150,000 miles or five years. It is a phosphate-, nitrate-, nitrite-, silicate-, borate-, and amine-free formula, making it compatible with all other antifreeze colors and safe for various metals and gaskets. For those who prefer concentrated coolants, the Propylene Glycol Antifreeze offers an eco-friendly option that requires mixing with distilled water and provides superior protection against metallic corrosion and erosion.
Brake and power steering fluids are often overlooked but essential for safety. The 2008 Impala requires DOT 3 hydraulic brake fluid. AMSOIL’s 100% Synthetic DOT 3 and DOT 4 Brake Fluid offers excellent responsiveness for ABS and traction control systems. Its stable viscosity over a wide temperature range ensures consistent braking performance in both freezing winters and hot summers. Similarly, the power steering system benefits from AMSOIL’s 100% Synthetic Multi-Vehicle Power Steering Fluid. This fluid reduces friction, keeps seals soft to prevent leaks, and offers strong anti-wear protection, contributing to quiet and reliable operation.
About the Vehicle
The 2008 Chevrolet Impala represents the continued evolution of GM’s full-size sedan line, built on the W-body platform that had been in production since the mid-1990s. By this model year, the Impala had firmly established itself as a reliable, comfortable, and spacious vehicle, widely recognized for its suitability as a family sedan or a fleet vehicle. The model offered a range of engine options, including the V6 and V8 variants, with the 3.9L V6 being a popular choice for those prioritizing a balance of fuel economy and adequate power for daily commuting.
Drivers of the 2008 Impala often appreciate the vehicle’s smooth ride quality, which is attributed to its tuned suspension and large tires that absorb road imperfections effectively. The interior typically offers generous headroom and legroom, making it a comfortable choice for long highway drives. The 3.9L engine, while not a high-revving performance unit, provides sufficient torque for merging and passing, and its straightforward design contributes to its reputation for dependability when properly maintained.
As a front-wheel-drive sedan, the Impala handles predictably and is easy to manage in various weather conditions. Its design prioritizes practicality, with a large trunk and a roomy cabin that can accommodate passengers and cargo with ease. The vehicle’s market position during this era was strong as a value-oriented full-size sedan, offering features like stability control and antilock brakes as standard or optional equipment depending on the trim level. While it may not have the sporty handling of a coupe or the ruggedness of an SUV, the 2008 Impala remains a solid choice for those seeking a dependable and comfortable transportation solution for years of service.