The 1990 Oldsmobile 88 Royale with the 3800 V6 engine uses a
distributor ignition system. Therefore, the starter location is
on the passenger side of the engine block, generally towards the front. It's usually bolted directly to the engine block.
However, without visual access to the specific vehicle, this is just a general location. A repair manual specific to your year and model would give you the most accurate and detailed information, including pictures.
