2018 Toyota Tundra Complete Fluid Specifications Guide

As an ASE-certified master technician, I can tell you that using the right fluids in your truck is the difference between it hitting 300,000 miles on original parts and facing catastrophic failures before the warranty even expires. The 2018 Toyota Tundra, equipped with either the 4.6L (1UR-FE) or 5.7L (3UR-FE) V8, is legendary for its reliability. However, that reputation relies heavily on strict adherence to Toyota’s factory fluid specifications.

Whether you are performing routine maintenance in your driveway or bringing your truck to a professional, you need to know exactly what goes into every system. Below is the complete factory-spec fluid guide for the 2018 Toyota Tundra.

Quick reference

Fluid	Type/Spec	Capacity
Engine Oil (4.6L V8)	0W-20 Full Synthetic (API SN/SP, ILSAC GF-5/GF-6A)	8.3 qts (with filter)
Engine Oil (5.7L V8)	0W-20 Full Synthetic (API SN/SP, ILSAC GF-5/GF-6A)	7.9 qts (with filter)
Engine Coolant	Toyota Super Long Life Coolant (SLLC) - Pink	~11.1 - 11.3 qts (varies by tow pkg)
Transmission Fluid	Toyota Genuine ATF WS (World Standard)	11.6 - 12.4 qts (total), ~3 qts (drain/fill)
Transfer Case (4WD)	Toyota Genuine Transfer Gear Oil LF 75W	1.2 qts
Front Differential (4WD)	75W-85 API GL-5 (or 75W-90 API GL-5)	2.2 qts
Rear Differential	75W-85 API GL-5 (or 75W-90 API GL-5)	3.8 - 4.0 qts (varies by axle size)
Brake Fluid	FMVSS No. 116 DOT 3	System dependent (~1-2 qts for flush)
Power Steering Fluid	ATF DEXRON® II or III	System dependent (~1 qt for flush)
Windshield Washer Fluid	Standard washer fluid	Approx. 4.0 qts
DEF (Diesel Exhaust Fluid)	N/A (Gasoline only)	N/A

Note: Capacities are approximate. Always verify the fluid level with the dipstick or fill plug after servicing, and check your owner's manual or OEM service info for your exact trim.

Engine Oil

Toyota specifies 0W-20 full synthetic motor oil for both the 4.6L and 5.7L V8 engines. The original specification called for ILSAC GF-5 and API SN, but modern ILSAC GF-6A and API SP oils are fully backward-compatible and provide better timing chain wear protection and sludge prevention.

Intervals & Pitfalls: Toyota’s recommended interval is 10,000 miles or 12 months under normal driving conditions. However, if you tow frequently, idle extensively, or drive in dusty environments, I strongly advise severe service intervals of 5,000 miles or 6 months. Never use heavier weight oils like 5W-30 or 10W-40 unless absolutely necessary in an emergency, as the variable valve timing (VVT-i) system relies on the rapid flow characteristics of 0W-20.

Engine Coolant

The 2018 Tundra requires Toyota Super Long Life Coolant (SLLC), which is a pre-mixed 50/50 OAT (Organic Acid Technology) coolant. It is distinguishable by its pink color.

Intervals & Pitfalls: The factory fill is rated for 100,000 miles or 120 months. Subsequent replacements should be done every 50,000 miles or 60 months. Crucial Warning: Do not mix this with Toyota Long Life Coolant (Red), which is a HOAT fluid, or any generic "universal" green/yellow coolants. Mixing OAT with incompatible chemistries will cause the silicates to drop out of suspension, leading to gel formation that will clog your heater core and radiator.

Transmission Fluid

The 6-speed automatic transmission (AB60E/AB60F) mandates the use of Toyota Genuine ATF WS (World Standard).

Intervals & Pitfalls: Toyota technically calls this a "lifetime" fluid under normal conditions, but any ASE tech will tell you that heat breaks down fluid. If you tow, off-road, or haul heavy loads, a drain-and-fill every 60,000 miles is cheap insurance for a very expensive transmission. Never use universal ATF, DEXRON VI, or Mercon LV in this transmission. ATF WS has a specific friction modifier package designed for the slip-controlled lock-up clutch. Using the wrong fluid will cause harsh shifts, torque converter shudder, and eventual transmission failure.

Transfer Case (4WD Models)

For four-wheel-drive Tundras, the transfer case requires Toyota Genuine Transfer Gear Oil LF 75W.

Intervals & Pitfalls: Replace this every 30,000 miles under severe duty (towing, off-roading). While straight 75W is the strict OEM spec, high-quality 75W-90 GL-4/GL-5 is often used as an alternative by off-roaders in warmer climates. However, sticking to the LF 75W ensures the shift actuator works smoothly in freezing temperatures.

Front and Rear Differentials

Toyota specifies 75W-85 API GL-5 gear oil for both front and rear differentials. A high-quality 75W-90 API GL-5 synthetic gear oil is also a very common and acceptable alternative, especially for heavy towing.

Intervals & Pitfalls: Inspect every 15,000 miles and replace every 30,000 miles if towing or driving off-road. The 2018 Tundra utilizes an Auto LSD (which uses the brake system to mimic a limited-slip differential), meaning the rear axle is a standard open gear set. You do not need a limited-slip additive (friction modifier) for these differentials.

Brake Fluid

Use fresh, un-opened FMVSS No. 116 DOT 3 brake fluid. DOT 4 can be used as it is backward compatible and offers a higher boiling point, but DOT 3 is the factory spec.

Intervals & Pitfalls: Brake fluid is hygroscopic (it absorbs moisture from the air). Flush the system every 3 years or 30,000 miles. Never use DOT 5 (silicone-based) fluid, as it will destroy the seals in your ABS pump and master cylinder.

Power Steering Fluid

Unlike many newer trucks that have moved to electric power steering (EPS), the 2018 Tundra still utilizes a robust hydraulic setup. Toyota specifies ATF DEXRON® II or III for the power steering system.

Intervals & Pitfalls: Flush the power steering fluid every 50,000 miles. Do not use generic "Power Steering Fluid" off the parts store shelf, and do not use Toyota ATF WS. Standard Dexron II/III ATF is required to keep the pump lubricated and the rack seals conditioned.

Windshield Washer Fluid

Any standard windshield washer fluid is acceptable. If you live in a cold climate, ensure you use a winter-grade fluid rated for sub-zero temperatures to prevent the reservoir and lines from freezing and cracking.

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Proper fluid maintenance is the lifeblood of your Toyota Tundra. Don't skimp on cheap fluids, and never guess on specifications. If you aren't comfortable doing these flushes yourself, leave it to a certified professional. Find a trusted shop on Repairius.