1998 Cadillac Eldorado Owner's Manual - Page 292

Checking EngineOil Pull out the dipstick and clean it with a paper towel or cloth, thenpush it back in all the way. Remove it again, keeping the tip down, and check the level. NOTICE: Don't add too much oil. your engine has If so much oil that the oil level above the upper gets mark that shows proper operating range, the your engine could be damaged. A The oil fill cap is located behind the radiator on the passenger's side of the engine. Turn the cap to the left toremove it. When to Add Engine Oil If the oil is at or below the ADD line, then you'll need to add at least one quart of oil. But you must use the right kind. This part explains what kind of oil to use. For crankcase capacity, see "Capacities and Specifications" in the Index. Be sure to fill it enough to put the level somewhere in the proper operating range. Pushthe dipstick all the way back in when you're through. 6-12