Quote:
Originally Posted by mshac
My 1978 P337H POH mentions the primers as being useful in extreme cold weather starting conditions, but IIRC no exact temps are provided.*
Primers could also get one of your engines started (in a pinch) in case your electric boost pump failed.
Yes, there are other much longer threads, but this is about the gist of it.
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* The same cold-weather ops POH section recommends draining the oil when leaving the the plane overnight in an extreme-cold location. Suggests storing oil in a warm location, then re-filling engine with the warm oil before start-up.