Let?s see if this table of comparative oil viscosity will stay attached.
Duncan
> On Aug 21, 2018, at 1:03 PM, barry rosenberg via Fot <fot at autox.team.net>
> wrote:
>
> I agree on the 85-90 weight gear oil. A lot of people think the 90 weight is
> too heavy or thick but it is very close to a straight 30 or 40 weight motor
> oil. The viscosity of motor oil and gear oil is measured differently and at
> different temps. A gear oil has additives and structure that resists the
> shearing forces between the gear teeth. All TRs came from the factory with
> this oil and I have used it in customers cars over 40 years. Never a problem.
> One Healey 3000 had over 976,000 on one rebuild of the overdrive gear box! 90
> all the time.
>
> Barry
>
>
> Sent: Tuesday, August 21, 2018 1:51 PM
> Subject: Re: [Fot] D-Type Overdrive Recommended oil
>
> Joe,
>
> Not sure if anyone answered you yet but I always use 85-90W GL-4
> non-synthetic oil. The GL-4 is easier on the brass/bronze components. The
> NAPA brand is StaLube 85-90W. O?Reilly also has a 140W GL-4 if you want a
> heavier choice. Moss also carries the Dynolite brand in a straight 90W GL-4
> for $10 a quart.
>
> Mike
>
>
> Sent: Monday, August 20, 2018 1:55 PM
> Subject: [Fot] D-Type Overdrive Recommended oil
>
> I am about to dig into my overdrive that quit working and while I am at it I
> plan to change the oil. I have previously been using synthetic from Lucas
> but that is expensive and difficult to get where I live. So I am looking for
> recommendations of normal types of oil (Non-synthetic) for the best results
> using a D-Type Overdrive on a 4-Synchro 3-rail Spitfire gearbox.
>
> Thanks,
> Joe
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