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BMW N62 V8 Oil Usage – Burning, 545i, 550i, 645csi, 650i, 745i, 745li, 750i, 750li, X5, X6

June 20, 2011

This answer is applicable for many BMWs in addition to the one listed below.

Q
2004 545i
I seem to be using a lot of oil.   I am using about a quart every 1000 miles which is far more than it used to be.

A
Typically, when a late model BMW engine starts to use more oil than has been “normal”, this can be traced to a problem with the crankcase ventilation system. On the N62 V8 models (such as in your 545i), the pressure regulating valves can clog or rupture. The valves are located on the right and left valve covers, under the plastic trim covers. The valves are not expensive, you may want to replace them and see if this cures the oil usage.

N62 V8 Crankcase Ventilation Pressure Regulating Valves:
BMW

2 Comments
  1. David Lu permalink

    How would a crankcase ventilation pressure valve contribute to oil loss and would this apply to late model 2009 650i with 25000 miles? Would BMW dealership agree with this and repair it under warranty

    • Otto permalink

      Yes, the 2009 650i would be applicable to this issue, as outlined in the original post. We would not typically expect failed valves at 25,000 miles, but this does not mean that it can not happen. BMW is aware of this issue, but as is common, they do not always acknowledge issues like this to customers.

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