I know cause I have a keen sense of observation. I have a couple engines with the oil infection removed. Very smoky at idle. Oil injection leans it down a bit for idle when it isn't as necessary. I pre-mix 40:1 and can kill a mosquito better than one of those smog trucks.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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