Yeah I agree with post above. Thats the reason I m waiting to replace mine. This job requieres experience. I have a very slow VCG leak, My oil level has not moved in almost 5months. I will ask my friend whos a BMW tech and see how much he charges me for the VCG replacement. For now I need to change my spark plugs since they will be due at 100k miles. I wonder If I should do spark plugs and VCG at the same time. Anyone?