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      12-21-2009, 02:52 PM   #8
Cosmop
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Drives: 2009 E90 335i
Join Date: Oct 2009
Location: Houston, TX

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They only way your warranty would be voided is if you use the wrong oil type and messed up the engine. Use exactly the oil types the drivers manual say and your good. There is no way for the dealer to know and if you do it right they won't care either.