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I guess that one of the big reason that BMW recommended 15K oil change is for marketing. They want to project a low maintenance cost vehical image instead of high maintenance cost car since every one was complainting how much to maintain a BMW. It is a no brainer that the oil filter will get much dirtier for a 15K versus 5K oil change interval even the sythentic oil will last for 15K.
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7/08 135 Coupe, Crimson Red, 6 SP, Sport, Taupe Lette/Aluminum. Performance Mods: JB4 on Map 5, BMS DP Fix V3, Injen polished intake, AR Catless DP, Maddad resonated mid-pipes, aFe exhaust polished tips, ST Suspension Coil Over and Hotchkis front sway bar. Others: BMS OCC, BT Scanner, Mud Flap. Next Mods: AA Front Strut Brace.
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