RIGHT ON StorminN!!

On advice from my mechanic,I only use Premium fuel and good oil.If you need to save a few bucks,drink cheap beer.
I run a 140HP main and 8HP kicker on a 16' Glasply.Both Johnson.
The higher octane of Premium gas and the high quality oil helps prevent coking in the cylinders.That will kill your motor.
I tried some oil that was pricey(Quicksilver) thinking that meant quality.Not neccesarily so.Smokey..Smokey and foulin' my plugs.I went back to Johnson oil.

If you try to go cheap,it will bite you some day.
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Gettin' old ain't for wimps!