Date: 6 Nov 2002 09:24:15 -0800
From: (Lance Morgan)
Subject: Tranny fluid, again

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 Any comments/thoughts appreciated Lance

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