>Have followed gear lube threads and now that everyone knows how to get it
>in the transmission some other thoughts:
> I'm trying to get exact specs but I think I remember from somewhere
>that 80-90 weight gear oil has about the same viscosity as 30-40 weight
>motor oil. Apparently the powers-to-be gave gear oil different
>nomenclature so Bud or Earl didn't fill your engine crankcase with it.
> I've had several NON-OVERDRIVE mgs which have had both gear oil and
>engine oil in the tranny at some time. Although the book calls for engine
>oil I wouldn't worry about gear oil in your transmission (non-overdrive).
> What I've done is switch to Mobil 1 15/50 synthetic oil in both my
>engines and the tranny of my MGC (my TC uses 140wt ). These are low
>mileage cars and this way I usually change the oil yearly. The 15/50 flows
>at a lower temp than conventual 5w/30 so is great if you want to crank your
>car up in the winter. High temperature performance exceeds conventual 40
>or 20w/50 oils. If I burned or leaked a lot of oil it wouldn't be cost
>effective but for me it works out. Amsoil also makes a 20/50 synthetic but
>its even more expensive than Mobil 1 and I can't figure out their Amway
>style marketing system.
> Both engine crank great whatever the temperature is, oil pressure
>doesn't seem to vary with high temperatures and the transmission of the MGC
>seems quieter and shifts better with the synthetic.
> Bob Skillman (47TC,68MGC)
>
Everything you say is correct and I have official Castrol bulletins to
suppport it but I am curious why you appear to dismiss 80W/90 for overdrive
equipped cars. The MGB GT V8 manual in fact specifies the use of 80W/90 oil
in the gearbox (and they all had overdrive) and you will find that Triumph
and Jaguar specified 80W/90 for overdrive models. Some people here use Auto
Transmission Fluid with considerable success, although I tend to stick to
the manufacturer's specs.
regards,
Graham McCann Rivett, ACT. Australia
gmccann@pcug.org.au
06 2889055
______________________________________________________________
|