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Post Info TOPIC: Which posi gear oil should I use?
jim larson


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Which posi gear oil should I use?
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Getting closer, ready to add gear oil.  I went to Napa today.  I see different options.  I have a bottle of the AC Delco posi additive.  Can I mix different grades types?  Thanks



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Jim L

Lake City
Bobs_Place


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80W-90 GL5 would work, synthetic or non, look for EP (extreme-pressure) additive and for posi diffs.  if you can't find lube for posi diffs you can add the additive that you have if the clutches start to cheater/snap on corners. I wouldn't add the posi additive unless you need to as that stuff really STINKS!!! You can mix but I wouldn't if you can avoid it. I would recommend, with new clutches to change the lube sometime after 2-5000 miles do to the initial clutch ware, so don't spend the big money on synthetic until you change it.



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Bob W.

Lino Lakes
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80W90 is good, GM uses Mobil brand as their manufacturer. Look for LS (limited slip) on the label.

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Bryan-NW 'burbs
1972 Malibu
Vaguely stock appearing, and the opposite of restored.
1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam
700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more
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