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Date: Sun, 29 Jul 2001 22:42:43 +0100
From: Johannes H Andersen <johsnopsamsafish.com>
Subject: Re: gearbox oil filling





Harry Davis wrote:
> 
> What year is you 9000?  Why should synthetic not be used in the 9000 gear
> box?  I have a 1996 9000 CS that has synthetic in the 5 speed gearbox and it
> shifts better than butter.

Haynes Manual covering 9000 models 1985-1995: "Synthetic oil not
to be used". I must admit I don't know the explanation. In other
cars I have owned, the gearbox oil is usually of a different type
than the engine oil because the friction between the gear wheels
occur under extreme pressure. Normally, gearbox oil is specified
as HP oil (high pressure). Saab uses ordinary oil for the gearbox.
Maybe synthetic is less pressure resistant, but this is a guess.

Johannes
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