Neighbors gas 8 octane over recommended?

robertz6April 12, 2012

I was walking by today when a neighbor was trying to get his Craftman walk behind mower started. He said the plug was new and he was running it without a filter (which I never did).

But the point I had a question about was the octane, I imagine the manual says 87 octane for the Sears, he said he went to premium (I guess 93 octane). If higher octane runs the engine hotter, is this enough to shorten engine life?

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Whoops, I can't subtract. That would a difference of 6 not 8 octane.

    Bookmark   April 12, 2012 at 2:59PM
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No he is just wasting his money.

    Bookmark   April 12, 2012 at 4:03PM
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Actually the higher octane will run cooler. More likely to cause carbon buildup. A waste of money.

    Bookmark   April 12, 2012 at 11:03PM
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When I bought my (Stihl) chainsaw a few years ago, the tech told me to use premium because it contains less ethanol than 87/regular.

I haven't had time to confirm if that statement is true.
That said, the saw and everything else I run on super, works great.

Other than that, unless you're running a high compression engine, the extra octane is a complete waste of money.

    Bookmark   April 13, 2012 at 5:17PM
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An't gong to matter! running the engine with the air filter removed will alow all the dust, grass clippings, to be sucked down the carb. If that don't plug the carb. up it will soon wear the piston to cylinder wall clearance, turn the oil to gritty past and it will start smoking, knocking, and eventually won't start. If he really wants to save money and heartaches down the road spend the extra money he is wasting on high octane gas on a new air filter. That would be the best bang for his buck if it an't too late???????????????????????????????????????????????????????????????

    Bookmark   April 16, 2012 at 7:08PM
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