2018 Toyota Highlander Fluid Type Specs

Quick Reference

Engine Oil

For the 2018 Toyota Highlander, the recommended engine oil is Toyota Genuine Motor Oil 0W-20 or a full synthetic equivalent that meets API SN/SN PLUS or ILSAC GF-5 standards. The 2.7L 4-cylinder engine requires approximately 4.8 quarts (4.5 liters) with a new filter, while the 3.5L V6 engine takes around 5.8 quarts (5.5 liters) with a filter change. Always verify the level on the dipstick after an oil change. Using a high-quality full synthetic oil is crucial for protecting the engine from wear, reducing friction, and ensuring optimal performance and fuel economy. Regular oil changes are essential for engine longevity, and it's recommended to follow the manufacturer's suggested intervals, typically every 10,000 miles or 12 months under normal driving conditions.

Engine Coolant

The 2018 Highlander uses Toyota Super Long Life Coolant (SLLC), a pink-colored, ethylene glycol-based coolant. It's vital to use this specific coolant, as mixing it with other types can lead to cooling system damage. The 2.7L 4-cylinder engine's cooling system has a capacity of 10.1 quarts (9.6 liters), and the 3.5L V6 engine holds 10.4 quarts (9.8 liters). SLLC is a 50/50 pre-diluted coolant, so you shouldn't add water. The initial factory fill is designed to last for 100,000 miles or 10 years, with subsequent changes recommended every 50,000 miles or 5 years.

Transmission Fluid

The 2018 Highlander is equipped with a sealed automatic transmission that requires Toyota Genuine ATF WS (World Standard) fluid. This fluid is specifically designed for Toyota transmissions, and using any other type, especially universal ATF, can result in poor shifting, transmission shudder, and eventual failure. The 2.7L 4-cylinder model has a transmission fluid capacity of 6.9 quarts (6.5 liters), while the 3.5L V6 model requires 7.2 quarts (6.8 liters). Although the transmission is "sealed," it's still advisable to have the fluid inspected every 30,000 to 60,000 miles and changed if necessary, particularly if you tow or drive in demanding conditions.

Transfer Case and Differential Fluid (AWD Models)

For all-wheel-drive (AWD) models, the transfer case and both the front and rear differentials require Toyota Genuine Differential Gear Oil LT 75W-85 GL-5 or an equivalent. The transfer case holds 0.9 quarts (0.85 liters), while both the front and rear differentials have a capacity of 0.5 quarts (0.45 liters). Regular inspection of these fluids is recommended, especially after off-road use or water submersion. It's a good practice to change the gear oil every 30,000 to 60,000 miles to ensure proper lubrication and prevent wear on the gears.

Brake Fluid

For the brake system, use Toyota Genuine Brake Fluid DOT 3 or an equivalent from a sealed container. Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time, which can lower its boiling point and lead to brake fade. Therefore, it's crucial to change the brake fluid every 2-3 years or 30,000 miles, regardless of mileage. When topping off the reservoir, ensure no contaminants are introduced, as this can compromise the brake system's performance and safety.

Power Steering Fluid

The 2018 Toyota Highlander is equipped with an Electric Power Steering (EPS) system, which means it does not use hydraulic fluid for power assistance. This system uses an electric motor to reduce steering effort, eliminating the need for power steering fluid, pumps, and hoses. As a result, there is no power steering fluid to check or change.

Windshield Washer Fluid

For the windshield washer system, you can use Toyota Genuine Windshield Washer Fluid or any high-quality equivalent. The reservoir has a capacity of 2.6 quarts (2.5 liters). It's important to use a fluid that is formulated for your climate, especially in colder regions where a freeze-resistant fluid is necessary to prevent damage to the washer system.

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