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The correct fix is valve guides or new heads. Valve seals wont make a difference once the guides are worn. Since this is a well known problem and just about every 4.8 ever made has this issue or will encounter it at some point, BMW should really step up and stand behind them all!!! I owned the cleanest 4.8is I had ever seen out of a showroom and had to part with it because I didn't want to drop approx $10k to have the job done right.
I did put some valve stem sealer in it with pretty good success but as you said this is only a band-aid fix.
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08-09-2015, 06:15 AM
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