Gasolines For Cleaner Air - Oldsmobile 1995 88 Owner's Manual

Gasolines for Cleaner Air
Your use of gasoline with deposit control additives will
help prevent deposits from forming in your engine and
fuel system. That helps keep your engine in tune and
your emission control system working properly. It's
good for your vehicle, and you'll be doing your part for
cleaner air.
Many gasolines are now blended with oxygenates.
General Motors recommends that you use gasolines with
these blending materials, such as MTBE and ethanol. By
doing so, you can help clean the air, especially in those
parts of the country that have h g h carbon monoxide
levels.
In addition, some gasoline suppliers are .now producing
reformulated gasolines. These gasolines are specially
designed to reduce vehicle emissions. General Motors
recommends that you use reformulated gasoline. By
doing so, you can help clean the air, especially in those
parts of the country that have high ozone levels.
You should ask your service station operators if their
gasolines contain deposit control additives and
oxygenates, and if they have been reformulated to
reduce vehicle emissions.
Fuel
3800 Supercharged Engine (Code 1)
The 8th digit of your vehicle identification number
(VIN) shows the code letter for your engine. You will
find the VIN at the top left of your instrument panel.
(See "Vehicle Identification Number" in the Index.)
Use premium unleaded gasoline rated at 91 octane or
higher. You may use middle grade or regular unleaded
gasolines, but your vehicle may not accelerate as well.
The gasoline you use should meet specifications ASTM
D4814 in the United States and CGSB 3.5-92 in
Canada. These fuels should have the proper additives, so
you should not have to add anything to the fuel.
In the United States 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 for premium is at least 91 (at
least 89 for middle grade and 87 for regular). If the octane
is less than 87, you m y 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 91 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
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