How do you tell the difference between a plain 1991 Oldsmobile Quad442 and W40 or W41 Quad442?
The W40 (and later the W41) Quad 442 was an appearance/handling package and did not have any special engine modifications other than special exhaust system. These models feature gold emblems on the front fender, rear decklid, and steering wheel featuring the W40 or W41 designation, and 16" (later 17") snowflake style alloy wheels.