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Re: lubricants

To: <healeys@autox.team.net>
Subject: Re: lubricants
From: "Bob Spidell" <bspidell@comcast.net>
Date: Sun, 29 May 2005 23:00:59 -0700
Further, it looks like MT90 is a 75W-90 GL-4 lube, without EP
additives, which is appropriate for Healey gearboxes and O/Ds.

http://www.redlineoil.com/products_gearlubricants.asp?pvID=74&prodID=57&subcatID=18


Maybe that's where the confusion set in ...


bs
***************************************************************
Bob Spidell         San Jose, CA        bspidell@comcast.net
'67 Austin-Healey 3000             '56 Austin-Healey 100M
***************************************************************

Subject: Re: lubricants


> Dave,
> 
> 
> I got this off the RL website re: 75W-90 gear oil.
> 
> "Our most popular gear oil, this is the preferred product in nearly all car
> and light truck differentials, both conventional and limited-slip.  75W90 is
> preferred for most racing applications.  It contains friction modifier which 
>is 
> recommended for limited-slip units.  75W90 Gear Oil can be used in many
> transmissions and transaxles; however, other Red Line lubricants have
> better frictional properties for rapid synchronization.  Exceeds API GL-5."
> 
> http://www.redlineoil.com/products_gearlubricants.asp?subcatID=20&prodID=60
> 
> 
> 
> Sounds like this is appropriate for Healey diffs ... am I missing something?
> 
> 
> 
> bs
> 
> ***************************************************************
> Bob Spidell         San Jose, CA        bspidell@comcast.net
> '67 Austin-Healey 3000             '56 Austin-Healey 100M
> ***************************************************************
> 
> Subject: Re: lubricants
> 
> 
>> Hi Bob,
>> 
>> I think most of your suggestions will work. Everyone seems to have their
>> own "pet" ideas on the subject.
>> 
>> I disagree with the RL 75W-90 in the differential. This is a API GL-4
>> rated oil & specifically says on the bottle "do not use in a rear wheel
>> drive differential which requires a GL-5 lubricant". GL-5 has more
>> sulfur additive which the high contact pressures in the differential
>> require.  Hypoid gears have a lot of sliding pressure contact. All but
>> the early BN1's have hypoid gears & should use GL-5 rated lube.
>> 
>> On the other end, sulfur compounds in the transmission are thought to
>> shorten the life of the "brass" synchro rings so a GL-4 oil is usually
>> used as you suggest.
>> 
>> Dave Russell




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