octane CHEVROLET TRACKER 1993 Owners Manual

I NOTICE
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Fuel
Use regular unleaded gasoline rated at
87 octane or higher. It should meet
specifications, ASTM
D4814 in the U.S.
and CGSB 3.5-M92 in Canada. These
fuels should have the proper additives,
so you should not have to add anything
to the fuel.
In the U.S. and Canada, it’s easy to be
sure you get the right kind of gasoline
(unleaded). You’ll see
UNLEADED
right on the pump. And only unleaded
nozzles will fit into your vehicle’s filler
neck.
Be sure the posted octane is at least
87.
If the octane is less than 87, you may
get a heavy knocking noise when you drive.
If it’s bad enough, it can damage
your engine.
If you’re using fuel rated at
87 octane or
higher and you still hear heavy
knocking, your engine needs service.
But don’t worry if you hear a little
pinging noise when you’re accelerating or driving up a
hill. That’s normal, and
you don’t have to buy a higher octane
fuel to get rid of pinging. It’s the heavy,
constant knock that means you have a
problem.
What about gasoline with blending materials that contain oxygen, such as
MTBE or alcohol?
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