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Synthetic Oil in Saab 9K Tranny
Posted by Lars Tomasson (more from Lars Tomasson) on Sat, 25 Jun 2005 18:32:55
In Reply to: Wow, I got agreement from the Great Quasi...., 9Shenandoah, Fri, 24 Jun 2005 04:40:18
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The owners manual on my 93 Saab 9K CSE says not to use sythetic oil in the manual transmissiion. That seems a simple enough instruction to follow.
The syncronisers are friction devices that match the input shaft rpm to the gear rpm. If the oil is too thick or too slipery, the syncronisers cannot get enough friction to match the speeds befor they lock the shft and gear together causing them to grind.
The problem with the synthetic oil is that it is too slipery (same reason synthetic oil is not recommended during engine break in). This particular transmision was designed for conventional oils.
I don't think I would experiment in this area unless Saab has specific factory recomendations.
posted by 64.105.65...
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