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Which one should I use

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Old 10-17-2008 | 10:50 AM
Lazerred6's Avatar
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From: Grand Rapids MI
Default 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


going for 4.10s btw
 
Last edited by Lazerred6; 10-17-2008 at 10:54 AM.
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Old 10-17-2008 | 11:50 AM
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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.
 
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Old 10-17-2008 | 11:53 AM
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75w90
 
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Old 10-17-2008 | 03:57 PM
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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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