I just did the VCG and vanos seals on my 3.0. They're both quite easy but were fairly time consuming for me. I don't have the best working area though. The hardest part was getting the stupid cooling fan back on. Actually, that's not true. The hardest part was finding the bolt I dropped below the engine. Just be careful not to drop anything haha. The Besian Systems tutorial is both comprehensive and easy to follow. It tells you just about everything you need to know.

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2003 X5 3.0i, 150k miles