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Originally Posted by ff
Has BMW fixed the stalling "ZHP" engines yet?
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No stalling issues on mine (07/04 build) in a year and a half and 14,000 miles. Clearly no maintenance difference between zhp/zsp. Runs slightly rough at cold start but that's its hot-cammed nature. Just rev to 6800 once in a while
Had it all the way down to -10F, no reliability issues. Engine stronger and more economical than new. The m54 may not be the most exciting engine but it gives me the impression of being built for the long haul.