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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