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While I agree to some extent...
Posted by Stephen Goldberger (more from Stephen Goldberger) on Tue, 6 Sep 2005 13:57:55
In Reply to: Re: switching to synthetic, Mr. Frog, Mon, 5 Sep 2005 19:44:55
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that conventional oil can perform just fine in a C900. That said, IMO the link is totally bogus for Saab owners. Turbocharging puts far more stress on oil than just driving it in a taxi cab - in fact, the typical cab driver's "binary throttle" strategy will keep the rpms up and thus ensure plenty of oil pressure to maintain bearing lubrication, plenty of splash on the cylinder walls, and plenty of coolant flow to keep it cool. The turbo exposes the oil to very high temperatures, and the added thrust of the engine comes from much higher loads through the bearings. In addition, you just can't provide a high level of viscosity in the bearings *and* low viscosity for proper lubrication during startup *and* limit the amount of VI Modifiers in the oil. VI modifiers tend to be the component in the oil that "cokes" (turns to coal) at high temperature.
posted by 65.25.6...
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