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Be nice.
Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Wed, 4 Jul 2007 10:13:44
In Reply to: Re: Turbo Heat makes oil black ??, 8AA2YM, Wed, 4 Jul 2007 07:55:21
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Yes, turbos are harder on the oil, but not so much as to account for the diesel-like oil blackening in 9-5s. Two factors, IMO:
a) The widely accepted fact that the engines have high blowby resulting from the "low friction" rings.
b) The extra quart of old oil that stays in the oil cooler during an oil change.
The blackness of the oil indicates sludge on the way to forming, which it will once the additives in the oil are depleted.
Those of us who experienced Saab turbo motors from the 1980s and 1990s are accustomed to a more ordinary rate of oil darkening, whether we had air/oil cooled turbos or the more recent water cooled units. What the water cooling does mostly is keep the oil left in the bearings after the engine was turned off from burning off into hard carbon deposits. It doesn't do that much to limit the heat the oil sees in operation on account of the hot component (turbine shaft) is oil bathed, while the bearing housing is where the water is.
posted by 24.33.227...
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