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Originally Posted by AaronMartinSole
How do I know if mine is a 4 or a 3 speed?
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You could count the shifts as you accelerate gently from rest up to about 55 mph.
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Surely 0W-20 should increase mileage, right?
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Yes - minutely. But not likely enough to register above the normal variation in tank-to-tank comparisons.
That's the only "mod" you made, by the way. Everything else is just "maintenance".