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Differential Oil
https://slantsix.org/forum/viewtopic.php?t=22945
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Author:  emsvitil [ Sun Apr 29, 2007 1:33 pm ]
Post subject:  Differential Oil

The specs for my 64 call for

Hypoid Lubricant

or

Multi-Purpose Lubricant


Is that equivalent to GL-4 or GL-5?


When did the GL-4 and GL-5 specs come out?


If it's GL-4, any harm in using GL-5? (I have some leftover GL-5 quarts)

Author:  AnotherSix [ Tue May 15, 2007 11:24 am ]
Post subject: 

GL 5 is fine, so is GL 6. I like to run a synthetic 80-90wt since they meet the viscosity spec but flow much better cold and have less drag when hot too. Every bit helps when you have a small engine. Cost is not such an issue since it does not get changed very often.

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