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Re: GL-5 vs. GL-4 gear oil

To: spitfires@autox.team.net
Subject: Re: GL-5 vs. GL-4 gear oil
From: "Mike Chmura" <m.chmura@umassp.edu>
Date: Thu, 19 Oct 2000 09:00:50 -0400
Hello all,

I'm using a gear oil brand from Advance Auto Parts called ' Coastal'.  I read 
the label last
night and it basically says: API Service GL-5, GL-4, GL-3

My question: is something like this safe for the Spit's diff since it seems to 
say safe for
three GL levels?

Thx in advance.

michael chmura

Douglas Braun & Nadia Papakonstantinou wrote:

> For a fairly definitive technical explanation of this
> issue, go look at item #2 on this document:
>
> 
>http://www.pennzoil-quakerstate.com/Tech/Bulletin//DomesticMarketing/General/pdf/g14c.pdf
>
> Doug Braun
> '72 Spit

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