Rear diff fill plug wont budge-
I need help with my '89 rear diff- Need to get the lube changed out, but the fill plug won't budge with big 1/2 drive wrench & allen socket. The allen fits perfectly.
I know the housing is a alloy but don't know if it's magnesium, if magnesium then I can't heat with too much heat---- anyone had the same problem?
What would work to get this fill plug loose?
(1989 300SE)
Thanks!







