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Oh boy here we go again with “lifetime” issues - = now this coming from a 25 year ASE master tech - nothing is lifetime product! a manufacturer calls a lifetime product a 100,000 to 150,000 mile product in the eyes of a manufacturer that’s A lifetime so absolutely you should replace all the fluids in your vehicle including the front DIFF the rear DIFF, transfer case , no do not do a flush on BMW transmission / just a filter and fluid change . // oil 10 k (no way) think of a TT X5M - and the heat and friction it generates- 5-7k max I do on oil changes and I ONLY USE LUBROMOLLY / AMSOIL /Royal Purple - and always 2 cans of Ceretec and or MoS2 lubricity additive (yes they work) - as for a fuel injector cleaning or combustion chamber cleaning short of a heavy duty de-carbonization use BG44k - THE BEST! /// good luck . T
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