Wife had a 2007 VW Rabbit before we got married. Lifetime trans fluid. I've been around cars my whole life and was skeptical, but I wasn't going to mess with the warranty and washed my hands of it. Turns out that 6 or 7 years later VW changed their mind and suddenly was recommending a 75k ish change interval. Car already had 100k+ so I did it at that time. Point is, lifetime fluids is a really, really high engineering bar. I'm still skeptical, but I do agree with not messing around under the warranty.
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