The 2008 Toyota Highlander equipped with the 3.5L 6-cylinder 2GRFE A engine is a robust crossover SUV known for its reliability and versatility. However, to ensure this vehicle continues to deliver smooth performance and longevity, using the correct lubricants is essential. Proper fluid maintenance helps manage heat, reduces friction, and protects critical internal components from wear and tear. Whether you are tackling daily commutes, hauling cargo, or driving in extreme temperatures, selecting the right AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil, AMSOIL Oil Filter, WIX Oil Filter, WIX Air Filter, and transmission fluid can make a significant difference in your Highlander’s longevity.
Recommended AMSOIL Products
- AMSOIL Signature Series 5W-30 100% Synthetic Motor Oil – Engineered for the highest level of protection against wear and horsepower loss, offering up to 25,000 miles of guaranteed service life.
- AMSOIL Extended-Life 5W-30 100% Synthetic Motor Oil – Provides extended protection for up to 20,000 miles with superior cleaning power to keep the engine running smoothly.
- AMSOIL OE 5W-30 100% Synthetic Motor Oil – A cost-effective synthetic option that fights sludge and deposits while maintaining excellent performance for standard service intervals.
- AMSOIL 5W-30 100% Synthetic High-Mileage Motor Oil – Formulated specifically for engines over 75,000 miles to reduce sludge and improve engine cleanliness and performance.
- AMSOIL Oil Filter – Features high-efficiency filtration and extended service life to trap contaminants and ensure maximum oil flow.
- WIX Oil Filter – A premium aftermarket filter offering improved performance over standard OEM-branded filters.
- WIX Air Filter – Premium media offers improvements over original equipment manufacturer (OEM)-branded filters.
- AMSOIL Passenger Car & Light Truck Antifreeze & Coolant – A unique poly-organic acid formulation that protects cooling systems up to 150,000 miles or 5 years.
- AMSOIL Propylene Glycol Antifreeze and Engine Coolant – Concentrated protection for up to 150,000 miles.
- AMSOIL Signature Series Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Designed to withstand heavy towing and elevated temperatures while remaining fluid in sub-zero conditions.
- AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid – Protects against wear with OE performance standards.
- AMSOIL SEVERE GEAR® 80W-90 100% Synthetic Gear Lube – Advanced protection for limited-slip differentials and transfer cases, controlling thermal runaway and rust.
- AMSOIL SEVERE GEAR® 75W-90 100% Synthetic Gear Lube – Advanced protection for limited-slip applications.
- AMSOIL SEVERE GEAR® 75W-110 100% Synthetic Gear Lube – High viscosity protection for demanding gear applications.
- AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid – Ensures excellent ABS responsiveness and stable viscosity across a wide temperature range.
One of the most critical maintenance tasks for the 2008 Highlander is the oil change. The 3.5L 2GRFE engine requires 6.4 quarts of oil, including a filter replacement. While factory recommendations often suggest standard intervals, synthetic motor oils from AMSOIL allow for extended service life, reducing the frequency of oil changes while providing superior protection. The AMSOIL Signature Series is the premier choice for drivers who want the maximum possible protection against engine wear, offering up to 25,000 miles of service. For those looking for a balance of protection and value, the Extended-Life formula extends protection to 20,000 miles. If your Highlander has accumulated high mileage, the High-Mileage variant includes additives designed to condition seals and reduce oil consumption.
Filtration is equally important to oil performance. A high-quality filter ensures that contaminants are removed before they can cause damage to bearings and other critical engine parts. The AMSOIL Oil Filter is engineered with a high-efficiency filtration media that traps 99% of particles at 20 microns, protecting the engine during both cold starts and extended service intervals. Alternatively, the WIX Oil Filter offers a robust filtration solution that exceeds many original equipment standards.
Transmission and Drivetrain Lubrication
The automatic transmission in the 2008 Highlander is a critical component that benefits greatly from synthetic fluid. The vehicle uses approximately 3.7 quarts for an initial fill and around 9.5 quarts for a complete fill of the 5-speed U151F transmission. Standard transmission fluids can degrade over time, leading to shifting issues and increased wear. The AMSOIL Signature Series Fuel-Efficient Automatic Transmission Fluid is designed to withstand the rigors of heavy towing and challenging terrain while maintaining optimal viscosity in extreme temperatures. It provides a reserve of protection during heavy use, helping to extend the life of the transmission. For OE performance, the AMSOIL OE Fuel-Efficient 100% Synthetic Automatic Transmission Fluid offers protection against wear.
The drivetrain also requires specific attention, particularly for models equipped with four-wheel drive. The transfer case and rear differential require gear lubricants that can handle high pressure and heavy loads. The AMSOIL SEVERE GEAR® 80W-90 is an excellent choice for these applications. It contains friction modifiers specifically for limited-slip differentials and helps control operating temperatures, preventing thermal runaway that can destroy gear teeth. This gear lube offers long oil, seal, and equipment life, ensuring the drivetrain remains quiet and functional. For different conditions, the AMSOIL SEVERE GEAR® 75W-90 and AMSOIL SEVERE GEAR® 75W-110 are also available for specific load requirements.
Cooling System and Brake Fluid
Maintaining the cooling system is vital for the longevity of the Highlander’s engine. Depending on the specific configuration of your vehicle, such as the presence of a tow package or remote rear A/C, the AMSOIL Passenger Car & Light Truck Antifreeze & Coolant capacity can vary between 9.3 and 12.4 quarts. It is crucial to use a AMSOIL Propylene Glycol Antifreeze and Engine Coolant that provides robust corrosion protection for all metals in the cooling system. The AMSOIL Passenger Car & Light Truck Antifreeze & Coolant features a unique poly-organic acid (OAT) formulation that is compatible with a wide variety of vehicles. It offers up to 150,000 miles of protection and is free from phosphates, nitrates, and silicates, which can cause corrosion over time.
For the braking system, the AMSOIL DOT 3 and DOT 4 100% Synthetic Brake Fluid ensures superior performance. Synthetic brake fluids have higher boil points than conventional fluids, which means they maintain their viscosity and performance even during repeated heavy braking. This stability is crucial for preventing brake fade and ensuring consistent ABS and traction-control responsiveness, keeping your Highlander safe on the road.
Additional Maintenance Products
Beyond the essential fluids, there are several other products that can help maintain the performance of your Highlander. The WIX Air Filter ensures clean air enters the engine, improving combustion efficiency and reducing wear. For fuel system maintenance, the AMSOIL P.i.® Performance Improver Gasoline Additive can restore up to 14% of horsepower by cleaning fuel injectors and removing carbon deposits that build up over time. This additive is particularly beneficial for gasoline direct injection (GDI) engines, helping to maintain optimal flow rates and fuel economy. Other useful products include the WIX Cabin Air Filters, AMSOIL Upper Cylinder Lubricant Corrosion Inhibitor, and AMSOIL Synthetic Multi-Purpose Grease for chassis maintenance.
About the Vehicle
The 2008 Toyota Highlander is part of the second generation of this popular mid-size crossover SUV, which was produced from 2008 to 2013. This model marked a significant shift for the Highlander as it transitioned from a truck-based platform to a unibody architecture shared with the Camry, resulting in a more car-like driving experience with improved handling and ride comfort. Under the hood, the 3.5L 2GRFE V6 engine was a standout feature, offering smooth power delivery and impressive reliability. This engine, known for its DOHC design and VVT-i (Variable Valve Timing with intelligence), provided a balance of fuel efficiency and robust performance suitable for both city driving and highway cruising.
Owners of the 2008 Highlander appreciated its versatility and spacious interior, which could comfortably seat seven or eight passengers depending on the configuration. The vehicle’s reputation for reliability made it a favorite among families and active drivers alike. With its availability in both front-wheel and all-wheel drive configurations, the Highlander offered flexibility for various weather conditions and driving terrains. The unibody construction contributed to a lower center of gravity compared to its predecessors, enhancing stability during cornering. This generation of the Highlander set a benchmark for the segment, combining practicality with a refined driving dynamics that appealed to a wide range of drivers.
“`