[Healeys] transmission / OD oil

Michael Oritt michael.oritt at gmail.com
Mon Aug 25 14:41:26 MDT 2014


Kees--

Over here at least the products that are corrosive to yellow metals are
labelled GL5 and are described as "Gear Oil", usually employing words such
as "High Pressure or "Extreme Pressure".

Some of these are rated as "GL4/5" but I am suspicious about their
suitability for either transmission or diff:  If they do not contain a mix
that gives "Extreme Pressure" protection they may or may not be okay for
brass parts but probably are not up to the loads that hypoid gears impose.
 OTOH if they are safe for the diff they might not be good for the
transmission for opposite reasons.

I'll stick with Redline MT90 in my transmissions, both street and track,
and any quality diff oil.

Best--Michael Oritt


On Mon, Aug 25, 2014 at 4:31 PM, Oudesluys <coudesluijs at chello.nl> wrote:

> SAE 30,40, 20W50 etc. is fine for OD gearboxes and gearboxes with
> brass/bronze parts like synchro rings or forks. Do not use EP80/90 as they
> may contain F, Cl and other elements based dopes that can be harmful to
> certain parts.
>
> Kees Oudesluijs
>
> MIKE LEWIS schreef op 25-8-2014 22:14:
>
>> Thought I would add that in the opinion of Healey trans/OD rebuilders like
>> Quantam Mechanics and Healey Surgeons best oil for the Healey Type A
>> overdrive
>> is a non detergent, 30 or 40 weight. QM only recommends 30 wt from what I
>> understand. The other oils like 20w50 that contain the detergent
>> additives are
>> not ideal for our overdrives.  I use 40 wt ND which you can get off of
>> Amazon
>> as otherwise hard to find a 40 wt ND.  think 30 wt ND is available from
>> several sources.
>> Regards
>> Mike Lewis
>> 1956 100M
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