octane CHEVROLET CORVETTE 1993 4.G Owners Manual

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Use premium ,unleadedgasohe rated at
91 octane higher, You may use
middle grade or rcgultir unleaded
gasolines, but-
your vehicle may not
accelerate as
well. The gasoline you use
should meet specifications ASTM
D4814 inthe US. and CGSB 3-5-92 in
Canada. These fuels should have the
proper additives, so you should not
have
to add- mything’to the fuel.
In the US. and Canada, it’s easy to be
sure. you get the right lrind of gasoline
(unleaded). You’ll
see “UNLEADED”
right QII the pump. And-only unleaded
nozzles
will fit into your vehicle’s filler
neck.
Be sure the posted-octane for premium
is at least 91 (at leatit 89 €or middle-
grade and 87 for regular). If the octane
is less than 87, yuu may get a heavy
knocking nu& when you drive. I€. it’s
bad enough, it
can damage YOLK engine.
If you’re usingfuel rated at 91 octane or
higher and you still hear heavy
knocking, your engine needs service.
But don’t wq 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.
Fuel Capacity: 20 U. S. Gallons
(75.7 L) . Use unleaded he1 only.
24 I ...

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= . 368
ooling sy§fem
heck coolant at the coolant reeuvery
tank by using the dipsti,&, Add coolant
at the coolant recovery tank. The fluid
should be at or a little- above the HOT
mark on the dipstick when the engine. is
w-arm. If the engine, is cool, th&vel
should be at COLD on the dipstick.
See Tire-Loading I
label on rear edgg '
of driver's dour. p
91 octane or higher.
See Page 24.1
See Page 269 a
Special Wheel Nut Socket
(Located. in Console)
See .Page 226