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BMW states 100K mile fluid change. So an extended 6yr/100K extended maintenance plan isn't going to cover the cost.
ZF says maintenance free fills under normal operation but under heavier use conditions then 60K to 75K miles. (80K to 120K kilometers.) Also stated is that driving at very high operating temperatures accelerates the degradation of the oil.
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-Brian
~199K miles. I -still- don't fear my 335i.
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