Hi Bob,
My profound apology to you. You are correct.
There is a 75W90 API GL-4 Gear Oil Called "MT-90" on the front label,
and also a 75W90 API GL-5 Gear Oil called "75W90 Gear Oil".
My mistake, sorry,
Dave Russell
Bob Spidell wrote:
> 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
>
> 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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