How often should I change the rear differential fluid in my tundra?
For most Toyota Tundra models, the rear differential fluid is recommended to be changed about every 60,000 miles (roughly 96,000 km) under normal driving. If you frequently tow, haul heavy loads, or drive in harsh conditions, plan for around 30,000 miles (roughly 48,000 km). Always check your owner’s manual for the exact interval for your specific year and axle configuration.
Recommended change intervals by driving conditions
Intervals vary based on how you drive. The following guidelines reflect typical Toyota maintenance recommendations for the Tundra’s rear differential.
- Normal driving: about every 60,000 miles (roughly 96,000 km).
- Severe driving: about every 30,000 miles (roughly 48,000 km). This includes frequent towing, heavy payloads, off-road use, dusty or high-heat environments, or lots of short trips where the fluid doesn’t reach full operating temperature.
Note that some year-models or axle configurations (for example, differing rear axle hardware or limited-slip differentials) may have slightly different recommendations. Always confirm with Toyota’s maintenance schedule for your exact truck.
Axle configurations and variations
The rear axle can vary by model year and trim, particularly with different gear ratios and differential types. The interval itself is generally the same, but the required oil type and any friction modifier for limited-slip units can affect the maintenance procedure.
Limited-slip differential and friction modifiers
If your Tundra is equipped with a limited-slip or electronically controlled differential, you may need to add a friction modifier to the gear oil in some configurations. Use the modifier specified by Toyota or the oil manufacturer, and confirm it with the owner's manual or dealer. Regardless of the interval, ensure you use the correct gear oil grade (typically GL-5 75W-90 or 80W-90) as recommended for your axle.
Warning signs that you should service sooner
Even if you are within the standard interval, certain conditions can warrant an earlier change. Watch for these indicators.
- Oil that looks dark, dirty, milky, or gritty on the fill plug – indicates contamination or breakdown.
- Burnt smell coming from the differential area.
- Unusual noises (moaning, grinding) when turning or under load.
- Oil leaks around the differential seals.
- Metal shavings seen on the drain or fill plug during service.
If you notice any of these signs, schedule service promptly to protect the differential gears and bearings.
DIY vs professional service
You can perform a differential fluid change yourself if you have the right tools and care, but many owners prefer professional service, especially if you have a limited-slip differential or a locking rear axle. Always use the recommended gear oil and follow Toyota’s guidelines for filling to the correct level. If in doubt, a Toyota technician can ensure the proper type, quantity, and torque specs.
Summary
Bottom line: expect roughly 60,000 miles between rear differential fluid changes under normal use, and about 30,000 miles if you tow often, drive in harsh conditions, or go off-road. Always verify with your owner’s manual for your exact truck, as intervals can vary by year and axle. Use the correct gear oil (GL-5 75W-90 or 80W-90) and follow any friction-modifier requirements for LSDs. If you notice signs of contamination or unusual noise, service earlier.
