How do you change oil on 1997 cutlass supreme?

Raise the front of the car on ramps or jack stands, or park it over a ditch.

Place a drain pan of at least 5 quarts capacity under the drain plug that is at the rear of the oil pan just behind the crossmember under the engine.

With a 15mm socket wrench, remove the drain plug. If the engine has been running recently, the oil may be quite hot (200+ degrees F). Take care to avoid having hot oil get on you.

Remove the oil filter. It can be seen from above on the front of the engine, and from below just above and behind the crossmember. There is a drain trough that guides the filter and oil ahead of the crossmember. A socket type oil filter wrench may be used from below, or a strap type from above. A small chain wrench will also work. Unscrew the filter and set it in the drain pan.

Once the oil has drained (it will keep dripping from both the drain plug hole and the oil filter adapter), wipe any dirt from the drain plug hole face and reinstall the drain plug. The O-ring gasket should be slightly proud of the face of the plug head. If it is not elastic, replace it with a new O-ring. The plug should be tightened firmly but not with great force. It must thread in freely with your fingers until the gasket contacts the face of the drain hole in the oil pan.

Wipe all dirt and old oil from the face of the filter boss.

Oil the gasket of the new oil filter with fresh clean engine oil. It is a good idea to fill the new filter with oil before installing it to help oil pressure to come up quickly. Not too much, or oil will spill out when the filter is tilted to screw it onto the filter adapter. The filter must "spin-on" freely. If there is any feeling of tightness at first, unscrew it and try again. Take care not to cross-thread the filter on the adapter.

When the filter gasket contacts the face of the oil filter boss finger tight, turn the filter another 3/4 to 1 turn, preferably with your hand alone. If you have to use the wrench, take care not to overtighten the filter or the filter base may be distorted and allow oil to leak.

Fill the engine with oil recommended by the car manufacturer to the "full" mark on the dipstick. Start the engine and let it run for a minute or so. Watch the oil pressure gauge or light to make sure oil pressure comes up quickly. Look for any leaks underneath, particularly around the oil filter.

Move the car to a level place and turn the engine off. Wait about 10 minutes to let the oil inside the engine drain back into the pan. Check the oil level and add oil if needed to the "full" mark on the dipstick.

If everything is OK, check the oil level again after the car has been driven and add oil to the "full" mark if needed.