The EP additive is necessary to protect your hypoid gear set. Limited slip
is a different animal.
Bill Lawrence
On 5/29/05 11:00 PM, "Bob Spidell" <bspidell@comcast.net> wrote:
> 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&subcat
> ID=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
|