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Would there be any advantages or disadvantages in using the higher octane gas in a stock 230 ?


DJ Thanks

There's no real advantage of higher octane gas in a T245 engine. The higher octane ratings came along as compression ratios increased, and a high-compression engine usually runs poorly with lower octane gas. The engines in our trucks have a much lower compression ratio than , say, the '60s-era "muscle cars." My brother would run nothing less than 100 octane in his Dodge Charger back "in the day." You can't even get that stuff now!

What Lifer says is true, but I have seen a trend lately of buying a couple of gallons of aviation gas for use while the trucks are in storage. It contains no system rotting ethanol and does have lead in it.


I wouldn't run it full time, but as a treatment before winter storage, some say it is a good thing. I have not personally tried it.

I use 100LL avgas in my M37, M151, golf cart and lawn mower, with no bad results -- other than the expense. None but the lawn mower get used much, and the vehicles can sit all winter in my hanger, without fear of the fuel going stale.

Lifer wrote:There's no real advantage of higher octane gas in a T245 engine. The higher octane ratings came along as compression ratios increased, and a high-compression engine usually runs poorly with lower octane gas. The engines in our trucks have a much lower compression ratio than , say, the '60s-era "muscle cars." My brother would run nothing less than 100 octane in his Dodge Charger back "in the day." You can't even get that stuff now!

Lifer I beg to differ, as a few of our local Sunoco stations were selling what they termed "racing fuel". This was within the last couple years. It was up around 100 octane, and was pretty expensive. Not sure if they are still selling it though.

I can't say much about the M37 motor as mine never ran and I'm going in a different direction, but I know my old VW as well as my M151 the higher octain made them run better.