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You shouldn’t hurt anything mechanically. It may run like shit if you switch fuel depending on the car, and you could get worse fuel mileage if the motor is designed for 91 Octane. I would recommend sticking to the gas the manufacturer recommends, but if you want to try 87, its not going to cause any mechanical issues.
[quote=”skatejake51″ post=48364]I just recently bought a ’92 Honda Prelude Si and in the fuel door it says to only use premium gasoline. It has 277k miles on it and with rising gas prices I was curious if it really mattered. So, will it hurt anything mechanically if I use 87 vs 91? I have gotten both answers online.[/quote]
I’m not being rude mind you, but do you think Honda engineers are playing a joke on you? Might be better to trust Honda engineers than faceless, anonymous opinions on the Internet.
If you use lower octane fuel than what is recommended by the vehicle manufacturer this can cause detonation within the combustion chambers, which can blow holes right through pistons, bend or break connecting rods, causing very serious and expensive engine damage.
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