Toyota-Lexus-Subaru-Honda Final Drive/Differential Gear Oil Service

Toyota doesn’t have any recommendations as to whether to ever replace the gear oils for the final drive except in the case of severe use, in which case they say to replace it every 30k. Lexus, their sister company, recommends that the gear oils be changed every 30k.

Toyota does say to inspect it every 15k. The fluid clearly degrades with use over time, changing from nearly clear or very light amber to black. It’s consistency changes over time as well.

Our belief is that the differential oil should be changed every 30,000 miles in order to avoid premature wear and costly repairs.