little story on overfilling oil:
a buddie of mine got a 1980 ford bronco once (one of the full size broncos) and if you started it up on flat level ground, everything was fine. but if you took it up a hill or tilted it side to side it would smoke like a freight train. had us puzzled for awhile. then he drained the oil to change it. it had 14 DAMN QUARTS IN IT!!!!!
....seems what was happining was. the dipstick tube was gummed up and when the previous owners would check the oil it would wipe it clean. showing it was low so they would put more oil in it
well after we put the correct amount in it, it rattled and ran like shit. every damn seal in it was blown