Mustang Boards - Which one should I use

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Lazerred6

10-17-2008 09:50 AM

Which one should I use

royal purple 75w90 or 75w140 or is there a better brand and option I know this has been covered before but i'm at work right now and don't have alot of time to search

on AM the 75w140 says recommended for S197s so I'm leaning toward the 75w90

Opinions please:D

going for 4.10s btw

bassman97

10-17-2008 10:50 AM

Not sure what the 7.5" needs but the 8.8 used either 80W-90 or 75W-140. My manual for my GT says the latter and since the latter is slightly less viscous, it may be better for mileage sake.

3.8LMustang

10-17-2008 10:53 AM

75w90

Lazerred6

10-17-2008 02:57 PM

Bump

any of you guys with 3.73 or 4.10 in you sixers what do you run in the rear diff

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