Differential Oil

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emsvitil

Post subject: Differential Oil

PostPosted: Sun Apr 29, 2007 1:33 pm

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Supercharged

Joined: Thu May 12, 2005 11:50 pm
Posts: 6291
Location: So California
Car Model: 64 Plymouth Valiant

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)

_________________
Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

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AnotherSix

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PostPosted: Tue May 15, 2007 11:24 am

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Turbo Slant 6

Joined: Tue Feb 14, 2006 4:49 pm
Posts: 566
Car Model:

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.