It depends on what type you have in mind. Synthetic oil is very slick and
if you don't have some chemicals in the synthetic oil that intensifies the
friction between the synchronizers and the gears, you will constantly be
grinding thegears as you shift. I am using Redline MTL and after several
years, I am very happy with it.
Joe
----- Original Message -----
From: "S1500" <s1500@comcast.net>
To: <spitfires@autox.team.net>
Sent: Monday, April 30, 2007 3:15 PM
Subject: [Spit] Synthetic gearbox oil? Yay or nay
> I'm almost done with the gearbox rebuild and thus subsequent road
> testing after that.
>
> Here's the brick wall I ran into: ran out of gearbox oil. I had 2
> bottles(totalling almost 2 bottles worth) of Valvoline 80w90 I put in.
> But with a rebuilt overdrive, it is needing quite a bit more.
>
> So I bought some of the same type. Only after I brought it home did I
> realize it had the word synthetic on it, looking like the original.
>
> I can't find regular tranny fuild anywhere in the twin cities. Pep
> Boys(only place that carries Castrol GT-LMA brake fluid) only has
> automatic tranny fluid.
>
> So..
>
> Is it safe to fill the remainder with synthetic 80w90, or will it digest
> the syncros?
>
> If not, what can I use for a substitute? Auto parts places around
> here(twin cities) seem to be carrying less and less old-fashioned needed
> supplies and more and more car decorations(Fast & The Furious-type car
> jewelry).
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