[TR] OD Oil

TERRY SMITH terryrs at comcast.net
Tue Jun 19 15:41:27 MDT 2018


Okay. As usual, I don't totally understand the technology. Ugh! I was an English Major! Then human services administration....

Is the answer that, since John Esposito put it in, ...that NAPA 30 wt non-detergent is okay? ...Or should I just stay with Mt-90 as all recommend here and use the 3 quarts of NAPA 30 in the lawn mower?I
Sorry to be so dense!!!!

Terry

> On June 19, 2018 at 5:29 PM Randall <TR3driver at ca.rr.com> wrote:
>
>
>
> > So my question. I've forgotten whether it was non-detergent.
> > I suspect so,since wouldn't that give it more grip????
>
> Thing is, the factory switched from recommending motor oil to specifying
> GL4. Seems to me they must have had a reason for making the change.
>
> Ken Gillanders (formerly British Frame and Engine) looked into the reason
> for the change, and was reportedly told by an ex-factory engineer that they
> were having trouble with premature failure of countershaft bearings/thrust
> washers. They felt the EP additives in the GL4 would help protect the
> bearing surfaces. Evidently it worked, because they continued to specify
> GL4 through the end of TR6 production.
>
> I can't say whether that is true, but I note that John Esposito also
> acknowledges it as a problem on these gearboxes, and offers to sell an
> (expensive) conversion to stronger bearings.
>
> His post about GL4 being too thick makes no sense at all to me. Even when
> the factory did recommend motor oil, they specified 50 weight for temps over
> 70F. 50 weight is actually thicker than 90 (at the same temperature)!
> (They are rated on different scales, which deliberately are offset from each
> other. No such thing as 50 weight gear oil, nor 90 weight motor oil.)
>
> -- Randall
>
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