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differential lube weight????

77-4speed

Well-known member
Joined
Apr 30, 2002
Messages
249
Location
Houston, TX
Corvette
1977 Black L-82 4-speed
Hi all,

I was just wondering if anybody knows what the weight is of the official GM differential lube. The GM stuff costs $7 at corvettes of Houston and it is a ways to drive, but Oreilly's carries the Penzoil 80W-90 oil for $3 a quart. Just wondering if it's essentially the same stuff.

Thanks,

Russ
 
C

c4ever

Guest
Any quality differential lube will get the job done but I do buy the GM additive. Can't help with the weight. I don't have my manual here.

Carlo
 

77-4speed

Well-known member
Joined
Apr 30, 2002
Messages
249
Location
Houston, TX
Corvette
1977 Black L-82 4-speed
Thanks guys,

I have already added 1 bottle of additive and I'm going to add another. I was told to get the Penzoil or other top-quality product of 80W-90 weight, but I read of someone using synthetic Amsoil at a weight of 145 in the rear. That weight kinda through me.

Russ
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
Don't even THINK about 145-weight anything; good old 75W90 or 80W90 will work just fine, or the GM lube; you'll need the GM Posi Additive in either case.
 

77-4speed

Well-known member
Joined
Apr 30, 2002
Messages
249
Location
Houston, TX
Corvette
1977 Black L-82 4-speed
thanks guys!!!

I guess I'll just get the Penzoil. I know it's only a savings of $12 but it's the principal. I hate to pay just for a name and not for quality. :)


Russ
 

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