In my BMW manual, it says my ATF & Differential fluid is Lifetime Fluid. Now if BMW was going to guarantee me that is for *my lifetime*, this question wouldn't even be posted
With that said and I have the standard 4 yr, 50K warranty.........whats your take on the Lifetime fluid or me doing preventive maintenance. My 2003 X5 is about to hit 23K-2 year mark. I would have done the above at the 30K mark with the ATF/diff fluid changes. I'll be bringing in the car to my local tuning shop to get a summer tar replaced and coolant changed.
A bmw technician told me he didn't recommend changing the lifetime fill fluid because, "the fluid has additives and detergents that cause increased wear during the early life of the fluid. Changing the fluid will cause accelerated wear that the mechanical components were not designed nor built to handle." I believe the OEM ATF fluid is Texaco ETL 8072B. The ATF fluid is around $100 for 5L --- BMW branded