Quote:
Originally Posted by Angry Aspie
My 91 Camry is down and out for now from engine gunk, and I'm wondering if I should have been putting premium grade in it instead of regular.
My sister had an 1986 Chevy Nova/ Toyota Corolla that would break down in traffic if bad gas was put in it, but was otherwise very reliable. I have heard some mechanics say grade is everything, or also that it means nothing.
Do you think there is any difference in the grades?
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Hmm, I was called stupid in other thread so take or leave my opinion as you want.
In older cars (with no computers) it was pretty important to use the correct grade because the advance(timing) of your valves was set up for the particular grade. Smaller (more precise) engines were particularly sensitive and usually required higher grades.
In modern cars, there is usually a variable timing (computer takes care of it) so it has became less important.
But I would always recommend to sort of follow what is required (or recommended) by the manufacturer. Or have the real professional to tune up yor engine.
And if you worry about your engine, do not put there ethanol (or gas with high volume of ethanol). It can mess up your small engine pretty well. (and gas with ethanol is always less pewerfull so the MPG is worse)
Rgds
John