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First, thanks to everyone for their help
-Air filter, plugs, battery have already been changed to no avail. I've been using Techron once a month. Have not changed the coil packs yet
-Oil separator system: wouldn't there be visible leaks or something? I don't mind changing out the entire system, but shouldnt there be other symptoms?
-Always have used BMW's 5-30 for the N52 engine, oil changes every 5-6k.
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