[Using a "high test" gasoline, higher octane, can actually be bad for a car if it doesn't call for an octane that high. The octane ratings correlates to when the gas detonates, so an octane too high can cause wrong detonation.]
There is no such thing as "wrong detonation" by using an unnnecesarily high octane for a particular engine, you just use up unnecessary $.
If you use too low an octane for a vehicle it will preignite and "diesel" (ie compression ignition), or pre-ignition, in advance of the spark, but using a higher octane has no negative effect.
There is no such thing as "wrong detonation" by using an unnnecesarily high octane for a particular engine, you just use up unnecessary $.
If you use too low an octane for a vehicle it will preignite and "diesel" (ie compression ignition), or pre-ignition, in advance of the spark, but using a higher octane has no negative effect.