Mike-
If you already have some "seepage" from the rear main area, I'd suggest not switching to synthetic oil until you get it fixed. In MY experiences, yes, you will have the niagra falls of oil leaks.
Ryan
Study hard and get thru the semester! Only a little longer!
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'84 Hilux, locked, dual-cased, winched, EFI converted, 37" tired, half-doored (in the summer...)
'87 Supra, 400 HP. smooth as glass at 130 'cause my tires are NEW!...
'92 F250 Diesel, tow rig, ATS Turbo, leveling kit, killer stereo