Quote:
Originally Posted by LEDZEP
Even if the function worked perfectly, and no one was experiencing any of the problems or quirks described here, it is a stupid and highly expensive (to the owner) system. The majority of wear and tear to the engine and related components occurs when it is started.
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That's definitely true on a cold start, because there isn't always a proper film of oil on key parts for lubrication purposes. On a warm start (and by warm I mean soon after the engine was shutoff) it's much less of an issue. I would hope that BMW, and all those hybrids that do frequent stop/start, have worked out some sort of system to minimize any issues.
As for other components, the starter and solenoid are likely the hardest hit, though I can imagine AC compressors and any other pumps may have some lube issues on a cold start.