Date: Sat, 9 Nov 2002 19:20:57 -0500
From: "Brian Lever" <>
Subject: Re: Tranny fluid, again

Synthetic oils are too slippery. Excellent for bearing life however too slippery for syncronizers to have a chance to funtion properly. Tranaxles are complex pieces of machinery that pose problems with lubricant selection. The differential gears require an oil with high shear strength...engine oils are a poor substitute for a gear oil ...hence the recommendation that trans. oils be changed regularily. Red Line products are a good compromise between the three distinctly different lubricant requirements of a trans axle.I've been running it for a while now ( driving in Canadian winters/summers which add viscosity problems to the mix), and have decided that its worth the money. Fatman PS I spoke with a chemist at Redline to help select a product, and he has been running it for years in his Saab. "Lance Morgan" <> wrote in message > This topic has been beat around pretty good, but I wanted to revisit > it, as I'm getting into a 5 spd 86 900T next week. > > It's seems to be general consensus that the pre-89 pinion gear (or > actually the pinion gear housing?) might be the first thing to go in > the tranny (well, something's got to go!) > > The manual recommends dino 10W-30 or 10W-40. In recent years, Saab > has apparently switched to syn? I'm not sure if their recommendations > have changed for c900s? It's unclear if the tranny gear cuts have > changed? > > Eriksson Industries recommends 10W-30 (think it's dino, but not sure - > may be syn) > > Anyway, I don't quite understand how the lubrication needs of a > transmission can be similar to that of an engine (and have felt the > dramatic improvements of using Redline MTL in by 85 VW GTI), altho > it's somewhat explained at the bottom-most URL > > I don't have the other URLs handy, but IIRC, Townsend has torn down > trannies (don't know how controlled this was), and Amsoil 20W-50 came > in first for least wear, with Mobil 1 second - both apparently showing > significantly less wear than dino > > I don't quite understand why 20W-50 viscosity was used, vs something > lighter. > > This also caught my interest, from an apparently very knowledgeable > Saab mech > > &lr=&ie=UTF-8&scoring=r& > > Any comments/thoughts appreciated > > Lance

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