RepairPal Certified shops can diagnose and repair your 2003 BMW 330i. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Make sure oil is recommended
Make sure you don't have any external leaks
If the cylone/breather system is blocked, oil vapour is burned more excessively
Is the engine sludged un the cap? If so could possibly indicate a blocked cyclone.