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Old 09-15-2019, 12:18 PM   #11 (permalink)
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Originally Posted by iikhod View Post
This is exactly what i meant, thank you.
I have heard somewhere that driving with ethanol would clean off them build-ups even better?
I hope that's true, because a 10% ethanol mix is all I can conveniently get around here. And even though straight gasoline is available in a couple of places, its extra expense doesn't seem to justify its extra MPG potential nor the efforts it takes to find and go get it.

Thanks go to our influenced politicians for this contrived state of affairs.

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Old 09-19-2019, 11:34 PM   #12 (permalink)
It's all about Diesel
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Originally Posted by MeteorGray View Post
I can't prove the Italians know what they are doing, but I "think" the technique helps keep the spark plugs and valves a little cleaner than they otherwise would be. The use of good quality gasoline which contain the proper cleaning additives also helps, I "think."
Not sure about the effectiveness of the "Italian tune-up", but in light aircraft still fitted with piston engines it's not unusual to lean the mixture for a while in order to increase the temperature in order to eliminate lead fouling around the spark plugs' electrodes. But anyway, at least in a port-injection engine, I wouldn't expect too much carbon buildup around the valve seats, even though in newer cars with direct injection the fine particulate matter emissions have increased to Diesel-like levels.

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