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-   -   Octane Booster vs 100 Octane? (https://www.offshoreonly.com/forums/general-boating-discussion/271835-octane-booster-vs-100-octane.html)

bwd 03-04-2012 06:23 AM

Pump the gas out into your truck or car and start over.

302Sport 03-04-2012 09:54 AM

Take out all the old fuel and run your first tank with straight 100LL. Top it with 100LL before your last run, and top it after when putting away for the winter. It is much better on your fuel system than pump gas. It has no ethanol, I can't believe nobody mentioned that yet.

Griff 03-04-2012 12:54 PM

Its only 2 month old fuel. Adding 5 gallons of the 100 octane will be more than adequate.

302Sport 03-04-2012 01:17 PM

I only run 100LL, nothing else, but I can write it off, so it ends up being cheaper than pump gas at the marina. Love the smell, and the internals are always very clean when the engine is opened up.

Racerngr1 03-04-2012 01:33 PM


Originally Posted by 302Sport (Post 3632807)
Take out all the old fuel and run your first tank with straight 100LL. Top it with 100LL before your last run, and top it after when putting away for the winter. It is much better on your fuel system than pump gas. It has no ethanol, I can't believe nobody mentioned that yet.

Couldn't running 100octane be harmful to your engine if your engine was only designed to run on 91?

GTOFFSHORE 03-04-2012 01:59 PM


Originally Posted by Racerngr1 (Post 3632943)
Couldn't running 100octane be harmful to your engine if your engine was only designed to run on 91?

Nope just more expensive.

Racerngr1 03-04-2012 02:32 PM


Originally Posted by Poker~N~Run (Post 3632955)
Nope just more expensive.

Good to know.

Griff 03-05-2012 12:41 AM


Originally Posted by Poker~N~Run (Post 3632955)
Nope just more expensive.

and you will actually lose HP if the engine was designed to run on 91 octane. You should also really add some Marvel's Mystery oil to it fi you run it straight.

302Sport 03-05-2012 08:43 AM

Why marvel??? The valves love the lead......

302Sport 03-05-2012 08:56 AM

This is from another thread.....


Originally Posted by 44MTI (Post 1821272)
If your choice is pump gas or 100ll av gas I would go with the 100ll. I had some 1050's that were set up a little on the lean side for 93, I decided to run the av gas and never had a problem and I ran this boat hard.
I spoke with Mike at sterling and he said the av gas was much superior to pump fuel and that the valves would really like the lead content. He did say that race fuel would be his first choice though. Just my experience..



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