* Your Owner's Manual: This is the most reliable source for this information.
* The dipstick: The dipstick will have markings indicating the minimum and maximum oil levels.
* A reputable online resource: Websites like AutoZone, Advance Auto Parts, or a Cadillac-specific forum often have this information.
* Contact a local mechanic or a Cadillac dealership: They can provide you with the correct oil capacity for your specific vehicle.
Please note that the engine oil capacity may vary depending on the engine size and type in your 1985 Cadillac Fleetwood Brougham.