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You can use what ever fuel you want to break in with long as it's under 30& nitro content and I don't use anything less that 11% oil content. In my opinion 16% and 20% doesn't do nitro engines justice. I have always ran 25 to 30% nitro in mine and I got a few engines with more than 10 gallons...

Not sure I'm not a OS fan. There expensive and I don't race so I don't see the point in spending that much money on a engine that in my opinion is not any better. I can buy two LRP Traxxas or dynamite engines for the price of one OS. Everyone has there own opinion that's just mine. I bought one...

I had a 4 tech and the Traxxas 3.3 is plenty in that car. If you wanting to go a little cheaper the dynamite .19 is a direct drop in too.