octane BUICK PARK AVENUE 1998 Owners Manual

Things you might add to the outside of your vehicle can
affect
the airdaow around it. This may cause wind noise
and affect windshield washer performance. Check with
your dealer before adding equipment to the outside
of
your vehicle. The
8th digit sf your vehicle
identification number
(Vm) shows the code lettee for your engine. You will
find the VIN at the top left of your instmment panel.
(See “Vehicle Identifkation Number’’ in the Endex.)
If you have the 3800 engine (VIN Code use regula
unleaded gasoline rated
at 87 octane or higher. If you’re
using fuel rated
at the recommended octane or higher
and
you 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.
If you have the 3800 Supercharged engine (VHN
Code I), use premium unleaded gasoline rated at
91 octane or higher. With the 3800 Supercharged
engine, in
an emergency, you may be able to use a
lower QC~XE -- as low as 87 -- if heavy knocking does
not occur. If you are using 91 cx higher octane unleaded
gasoline and
YOU hear heavy knocking, your engine
needs service.
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