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12-13-2009, 02:51 AM
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#7 |
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Learn to Relax
Drives: 2007, Meteorite, LB Join Date: Dec 2008
Location: Anaheim, CA
Posts: 2,070
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A dirty air filter doesn't make the oil dirty. The oil gets dirty from blow-by, gas escaping past the piston rings from the combustion chamber to the crank case. The heat in the crank case removes the hydrogen from the fuel and makes carbon which darkens the oil. as the engine wears or if you drive with spirit, you get darker oil.
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