Cadillac 1993 Fleetwood Owners Literature page 275

r
r
What Kind of Oil to Use:
Look for three things:
SG
__
"SG" must be on the oil container, either by itself or combined with
other quality designations, such as "SG/CC," "SG/CD," "SF,SG,CC,"
etc. These letters show American Petroleum Institute ( M I ) levels of
quality.
I _
b
I
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I