David,
Surely a GL-1 or GL-1/GL-2 wd be better for the Laycock O/D? I
understand from browsing Oil Co web sites that both GL-4 and GL-5 have
enough EP constituents to eventually damage the copper-based alloys.
Most of the oil companies make GL-1 and or GL-1/GL-2 gear oils still,
usually calling them suitable for farm equipment, but this still means
they are of higher quality than the oil available years ago.
Shell and Canadian Tire certainly sell them.
.......Pat
David Massey wrote:
>
> Message text written by "R. Ashford Little II"
> >Much confusion in my head about this. Apparently the original A-type
> manual
> recommends using 30wt engine oil whereas most people these days seem to use
> the more typical 80-90 wt gear oil. This seems like a large difference in
> viscosity so I was hoping that some of you can add your opinion to further
> confuse me.
> <
>
> It does seem like a large difference in viscosity but in actuality, it
> isn't. Oils are rated at the expected operating temperatures and engine
> oil is rated at a higher temperature than is gear oil. Hence the higher
> numbers for gear oil that is actually fairly close to motor oil in
> viscosity.
>
> If you can find GL4 rated gear oil, use it. GL5 has a higher level of
> sulpher compounds which has the potential of accelerating the wear of the
> brass parts in the transmission. Gear oil is a rather complex collection
> of additives and I'll leave it to others to explain the details.
> Personally, I use 30W non-detergent in the TR3 and Red Line MTL in the TR6
> (synthetic). Just remember, anything is better than nothing.
>
> Dave Massey
> 57 TR3 (30W non-detergent)
> 71 TR6 (Red Line MTL)
> 80 TR8 (ATF)
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