“Lifetime fluid” is doing a lot of work in that sentence. Heat is what actually sets the interval.
Lifetime, asterisk
Many owners never once change transmission fluid because the manual calls it lifetime — but heat breaks fluid down, and stop-and-go commuting is a heat factory. Burnt-smelling, dark fluid means the clutches inside are wearing faster than they should. A drain-and-fill on schedule is cheap; transmissions are not.
Quick tips
- Check the manual for the severe-service interval — commuting counts
- Shudder during light acceleration is often fluid-related and fixable
- A very high-mileage transmission that has never been serviced deserves a conversation first — sometimes leaving it alone is right
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