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Originally Posted by j9fd3s
most manufacturers set their cars up so that if you put the wrong gas in the tank, it doesnt explode, because if it does its a warranty claim. .
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that is exactly right. they have to because they know some people will put 87 octane for cars that specify 91 (on the flip side, there are people that waste money by putting high octane in cars that don't recommend or need it). On older pre-OBDII cars you could get more performance out of car by chipping computer. That was generally doable because chip would set fuel/ignition/timing curves so car would make more power but at the price that if you don't use 91 octane engine may blow because of knocking. If you search you will find info re: how US 300Es have a resistor that retards timing just in case 87 octane is used, whereas the Euro ones instead of a resistor have an adjustable thing that at the regular setting has no retard (more power than with retard) but requires high octane, but it can be adjusted to retard timing if you are somewhere where you can't get high octane.