Pennzoil in diffs?
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Joined: Oct 2003
Posts: 379
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From: Star, Idaho
Yeah, I'd stick with the synthetic stuff for sure! I prefer Amsoil, then Mobil 1; never have been a Penzoil fan...
Amsoil & Mobil 1 use group IV base stock (fully synthetic). Not sure about Royal Purple or RedLine (probably do). As far as I know, the rest use group III base stock.
I would go for the 75w/140 in the rear diff if I pulled a good load on a regular basis. I'd stick with 75w/90 in the front, unless your pulling the load in 4wd on a regular basis.
Amsoil & Mobil 1 use group IV base stock (fully synthetic). Not sure about Royal Purple or RedLine (probably do). As far as I know, the rest use group III base stock.
I would go for the 75w/140 in the rear diff if I pulled a good load on a regular basis. I'd stick with 75w/90 in the front, unless your pulling the load in 4wd on a regular basis.
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