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If I am not mistaken the job of the oil is twofold... lubricate the engine and remove contaminants such as carbon build up, etc. So, oil should get dirty if the detergents within it are doing their job as they should. I love the prolonged viscosity of synthentic oil though... but with my oil leak, I rarely have to worry about viscosity breakdown as the car gets a fresh cup of oil once a month.
I gotta get that fixed. The smell of burning oil makes me angry every time I get out of my boxster after a satisfying drive.
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