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B230FT octane choice 700

Howdy, I have read the FAQ comments on the ECU retarded timing when a lower octane gas is used, and lower power.

I recently went from stictly 91 octane to 87 when it was the only gas available and could not tell the difference (ie. no knocking or loss of power)

I have however, stuck to using only sythetic oil (Mobil 1 10W 30) but given the cost of it and frequent topping up due to a leaky turbo, I wouldn't mind saving a few bucks.

Has anyone using 87 or even 89 octane gas for a while noticed any longer term effects?

Thanks.






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