Quote:
Originally Posted by GScot
On the topic of lifetime fluid in automatic transmissions with the ZF 8 speeds there are many versions used by many automakers. It seems the consensus in the Audi and Mopar crowds that I'm familiar with is if you run it hard, especially drag racing, change it with a drain and filter at 30-50k miles depending on just how hard you drive it. If you treat it normal service interval about 60k miles seems good. Always just fluid drain and filter swap. Going for the full system flush seems to bring its own set of risks with high mile transmissions that get a flush being more prone to problems after a flush.
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I agree with what was stated above. For Lexus, I havent found one mechanic who recommended keeping the lifetime fluid in the care indefinitely, they all recommended a drain and fill if you have higher mileage and a flush if you start at 40-50k.