The 2018 Buick Enclave, equipped with the 3.6L V6 engine (Code LFY), is designed to deliver a smooth and powerful driving experience, but its longevity depends heavily on how well its internal components are cared for. Using the correct viscosity and formulation of motor oil is critical to prevent premature wear, especially given the stress placed on modern direct-injection engines. Proper lubrication ensures that sludge does not build up, maintaining peak performance and fuel efficiency over the vehicle’s life. By selecting the right fluids for every major system, owners can protect their investment against the rigors of daily driving, whether that involves city commutes or long highway hauls.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – The ultimate choice for extreme engine protection, offering superior control against sludge and wear, ideal for demanding driving conditions and extended oil change intervals.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – A robust option for those seeking high performance with added cleaning power, suitable for vehicles needing protection against low-speed pre-ignition and deposits.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – Designed to outperform conventional oils while meeting original equipment specifications, offering an excellent balance of protection and value for routine maintenance.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Specifically formulated for engines with over 75,000 miles to reduce consumption, minimize leaks, and restore cleanliness to aging engine components.
- AMSOIL Oil Filter – Provides 99% filtration efficiency at 20 microns and features a large capacity for contaminants, ensuring the engine receives clean oil and reducing wear.
- WIX XP Oil Filter – A premium aftermarket option featuring superior media that outperforms original equipment manufacturer filters in capturing harmful debris.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – An OAT-based coolant that protects cooling system metals and hoses for up to 150,000 miles or five years, eliminating the need for frequent changes.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Engineered to withstand high towing loads and extreme temperatures while maintaining fluidity in sub-zero conditions for the 9T65 transmission.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – A cost-effective synthetic solution that protects against wear and maintains shift quality, meeting the specific requirements for this vehicle’s transmission.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Offers advanced protection against wear and rust for the rear differential, helping to reduce operating temperatures and extending the life of seals.
- AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid – Formulated to keep seals soft to prevent leaks while providing strong anti-wear protection and excellent high-temperature performance.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Delivers a stable viscosity over a wide temperature range for excellent ABS responsiveness and reduced moisture absorption for superior braking safety.
- AMSOIL P.i.® Performance Improver Gasoline Additive – Restores horsepower and fuel injectors, removing carbon deposits to improve economy and engine smoothness.
When performing routine maintenance on your 2018 Enclave, selecting the right oil viscosity is the first step toward optimal engine health. The manufacturer specifies a 5W-30 viscosity for this engine, and AMSOIL Signature Series 5W-30, AMSOIL Extended-Life 5W-30, AMSOIL OE 5W-30, and AMSOIL 5W-30 High-Mileage offer formulations that meet or exceed GM Dexos1 Gen 3 specifications. The 2018 Buick Enclave’s 3.6L V6 is a robust powerplant, but like all modern engines, it is sensitive to oil degradation and carbon buildup. Synthetic motor oils provide a level of protection that conventional oils simply cannot match, particularly regarding volatility and shear stability. This ensures that the oil film remains intact under high stress, protecting critical components like the turbochargers and variable valve timing mechanisms. The engine capacity for a 2018 Enclave with the 3.6L engine is 6.0 quarts when the AMSOIL Oil Filter or a WIX Oil Filter is also changed. Always remember to check the oil level after refilling to ensure the correct amount is in the sump.
While the engine is the heart of the vehicle, the transmission is the backbone of its power delivery. This model comes equipped with a 9-speed automatic transmission (9T65), which requires specific attention to fluid quality. Using a standard transmission fluid can lead to sluggish shifting or accelerated wear, especially if the vehicle is subjected to towing or heavy loads. AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid and AMSOIL OE Fuel-Efficient Automatic Transmission Fluid are designed to handle the heat and shear forces generated by modern multi-speed automatic transmissions. For those with an OE transmission, the 5.3 quarts required for an initial fill or between 5.0 to 6.0 liters (approximately 5-6.3 quarts) for a fluid exchange should be topped with a high-quality synthetic to ensure smooth gear changes and maximum fluid life.
Maintenance extends beyond just oil and transmission fluid. The cooling system plays a vital role in preventing the engine from overheating, which can lead to catastrophic failure. The Enclave requires a specific amount of AMSOIL Propylene Glycol Antifreeze and Engine Coolant, typically around 15 quarts depending on the exact configuration and if the transmission cooler is included in the volume. AMSOIL’s antifreeze options, including the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant, are phosphate-, nitrite-, and silicate-free, ensuring compatibility with the metals and elastomers used in GM cooling systems while providing long-term corrosion protection. For the rear differential, which often sees less attention from owners, AMSOIL SEVERE GEAR 75W-90 Gear Lube helps control thermal runaway and protects against rust. Additionally, the power steering system and AMSOIL DOT 3 and DOT 4 Brake Fluid require periodic replacement to maintain the vehicle’s responsiveness and safety. AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid ensures seals remain soft and the system resists heat. Synthetic brake fluid has a much higher boil point than conventional DOT 3 or DOT 4 fluids, ensuring consistent braking performance even during repeated hard stops. Finally, for those looking to maximize fuel economy and engine cleanliness, a fuel additive like AMSOIL P.i. Performance Improver can restore lost horsepower and remove stubborn carbon deposits from the fuel injectors.
Vehicle Background
The 2018 Buick Enclave represents the second generation of GM’s large crossover SUV platform, built on the E2 platform which it shares with the Chevrolet Traverse and GMC Acadia. Launched originally in 2008, the Enclave has evolved into a flagship offering for Buick, designed to compete in the highly contested three-row family SUV market. Powered by the 3.6L high-feature V6 engine, known as the High Feature V6, this powertrain is celebrated for its blend of smooth power delivery and adequate torque for a vehicle of this size. The engine code LFY, specific to this model year, indicates a version optimized for the Enclave’s weight and aerodynamic profile, delivering horsepower that typically falls in the 310 horsepower range. This engine family is renowned for its dual overhead camshafts, active fuel management, and direct injection technology, making it a sophisticated piece of engineering that rewards high-quality lubricants.
Owners of the 2018 Buick Enclave generally appreciate the vehicle’s spacious interior, which offers seating for up to eight passengers with ample cargo space behind the second row. The driving character of the Enclave is tuned toward comfort, offering a ride quality that absorbs road imperfections well, though the 9-speed automatic transmission can occasionally feel hesitant in early model years if not properly tuned. The vehicle is a popular choice for families who need to transport children, pets, and sports equipment, often serving as a daily driver for school runs and weekend trips. Its market position is solid, sitting slightly above entry-level crossovers in terms of refinement and luxury features, while offering more space than mid-size two-row competitors.
Despite its reliability, the Enclave is not without its common issues, many of which can be mitigated or managed through the use of premium synthetic lubricants. One common concern with the 3.6L engine is the potential for excessive oil consumption, a problem that can stem from piston ring sticking or seals hardening over time. Using a high-mileage synthetic oil like the AMSOIL 5W-30 High-Mileage Motor Oil can help condition seals and reduce oil burn-off in older examples of this vehicle. Another frequent issue reported by owners is the shudder or shifty behavior of the 9-speed automatic transmission, particularly during low-speed maneuvers. This is often attributed to fluid breakdown or sensitivity to load; switching to a synthetic transmission fluid designed for low-speed pre-ignition and heat resistance, such as the AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid or AMSOIL OE Fuel-Efficient Automatic Transmission Fluid, can significantly smooth out these shifts and extend the life of the transmission clutch packs. Additionally, owners have noted that the 3.6L engine can be prone to carbon buildup on the intake valves due to its direct injection design. Regular use of a top-tier fuel injector cleaner, like AMSOIL P.i. Performance Improver, helps prevent this accumulation, which can otherwise lead to rough idling and reduced fuel economy. Finally, the power steering system on some Enclaves has been known to develop leaks or become noisy as the vehicle ages. A synthetic AMSOIL 100% Synthetic Multi-Vehicle Power Steering Fluid formulated to keep seals pliable and resist thermal degradation can help prevent leaks and restore quiet, responsive steering. By addressing these specific vulnerabilities with the correct fluids, Enclave owners can ensure their vehicle remains a reliable and comfortable companion for many years to come.