Penzoil Multi vis 20/50 in 4AFE, 4AC (mates car)
Penzoil Street machine 25/50 in new project revs motor..
have tried various semi synthetics 10/40, 15/50, 20/60, found mineral 25/50 to be the best comprimise because up here in the middle of the day it gets F$%#ING hot and oil turns to water thin..thats when engine failure occures....