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Immediatly, and depending on driving conditions: No. Oil doesn't affect gas mileage right as soon as the 3000 mi/km/engine light comes on.
It starts affecting gas mileage when it starts breaking down, getting really dirty/sludgy and then it affects gas mileage. But like i said, it's not likely to happen immediately as soon as the light comes on. (It could happen way before too, if you're driving hard in the winter cold/ summer heavy heat)
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