GM Cadillac 1967-1989 Repair Guide

Engine

Print

OIL LEVEL CHECK



See Figures 1, 2 and 3


CAUTION
Prolonged and repeated skin contact with used engine oil, with no effort to remove the oil, may be harmful. Always follow these simple precautions when handling used motor oil:

  1. Avoid prolonged skin contact with used motor oil.
  2.  
  3. Remove oil from skin by washing thoroughly with soap and water or waterless hand cleaner. Do not use gasoline, thinners or other solvents.
  4.  
  5. Avoid prolonged skin contact with oil-soaked clothing.
  6.  

Every time you stop for fuel, check the engine oil as follows:

  1. Make sure the car is parked on level ground.
  2.  
  3. When checking the oil level it is best for the engine to be at normal operating temperature, although checking the oil immediately after stopping will lead to a false reading. Wait a few minutes after turning off the engine to allow the oil to drain back into the crankcase.
  4.  
  5. Open the hood and locate the dipstick which will be on either the right or left side depending upon your particular engine. Pull the dipstick from its tube, wipe it clean and then reinsert it.
  6.  
  7. Pull the dipstick out again and, holding it horizontally, read the oil level. The oil should be between the FULL and ADD marks on the dipstick. If the oil is low, add oil of the proper viscosity through the capped opening in the top of the cylinder head cover. See the Oil Recommendations chart in this section for the proper viscosity and rating of oil to use.
  8.  
  9. Replace the dipstick and check the oil level again after adding any oil. Be careful not to overfill the crankcase. Approximately one quart of oil will raise the level from the ADD mark to the FULL mark. Excess oil will generally be consumed at a faster rate.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Checking the oil level - note location of oil dipstick



Click image to see an enlarged view

Fig. Fig. 2: The oil level should show between the ADD and FULL marks on the dipstick



Click image to see an enlarged view

Fig. Fig. 3: Always check the oil level while holding the dipstick horizontally

OIL AND FILTER CHANGE



See Figures 4, 5, 6, 7, 8, 9 and 10

The oil in the engine of your Cadillac should be changed every six months or 7,500 miles, whichever comes first (except diesels). If you live in an extremely dusty or smoggy area, change your car's oil more frequently. A new filter should be installed with every oil change, and the used oil put into a suitable container and taken to a collection or reclamation point for recycling (many garages and gas stations have storage tanks for this purpose).

Change the oil in diesel cars every 5,000 miles.

The oil drain plug is located on the bottom, rear of the oil pan (bottom of the engine, underneath the car).

The mileage figures given are the Cadillac recommended intervals assuming normal driving and conditions. If your car is being used under dusty, polluted or off-road conditions, change the oil and filter more frequently than specified. The same goes for cars driven in stop-and-go traffic or only for short distances. Always drain the oil after the engine has been running long enough to bring it to normal operating temperature. Hot oil will flow easier and more contaminants will be removed along with the oil than if it were drained cold. To change the oil and filter:

  1. Run the engine until it reaches normal operating temperature.
  2.  
  3. Put the transmission in Park, set the parking brake, and jack up the front of the car. Support the front end with jackstands.
  4.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Slide a drain pan of at least 6 quarts capacity under the engine oil pan.
  2.  
  3. Loosen the drain plug. Turn the plug out slowly by hand, keeping an inward pressure on the plug as you unscrew it so the hot oil will not escape until the plug is completely removed.
  4.  


WARNING
When you are ready to release the plug, pull it away from the drain hole quickly, to avoid being burned by the hot oil.

  1. Allow the oil to drain completely and then install the drain plug. DO NOT OVERTIGHTEN the plug, or you will strip the threads in the drain hole and you'll have to buy a new pan or a trick replacement plug.
  2.  
  3. Using an oil filter strap wrench, remove the oil filter. Keep in mind that it's holding about a quart of dirty, hot oil.
  4.  
  5. As soon as you remove the oil filter, hold it upright until you can empty it into the drain pan. Dispose of the filter.
  6.  


WARNING
Prolonged and repeated skin contact with used engine oil, with no effort to remove the oil, may be harmful. Follow these simple precautions when handling used motor oil.

  1. Avoid prolonged skin contact with used motor oil.
  2.  
  3. Remove oil from skin by washing thoroughly with soap and water or waterless hand cleaner. Do not use gasoline, thinners or solvents.
  4.  
  5. Using a clean rag, wipe off the filter mounting adaptor on the engine block. Be sure that the rag doesn't leave any lint which could clog an oil passage.
  6.  
  7. Wipe a coating of clean engine oil on the rubber gasket of the new filter. Spin it onto the engine by hand - DO NOT use the strap wrench. When the gasket starts to snug up against the adaptor surface, give it another 1 / 2 - 3 / 4 turn by hand. Don't turn it any more, or you'll squash the gasket and the filter may leak.
  8.  
  9. Refill the engine with the correct amount of fresh oil through the valve cover cap, or breather tube (diesels). See the Capacities chart in this section.
  10.  
  11. Check the oil level on the dipstick. It is normal for the oil level to be slightly above the full mark right after an oil change. Start the engine and allow it to idle for a few minutes.
  12.  


WARNING
Do not run the engine above idle speed until the oil pressure light (usually red) goes out, indicating the engine has built up oil pressure.

  1. Shut off the engine and allow the oil to drain back down for a few minutes before checking the dipstick again. Check for oil leaks around the filter and drain plug.
  2.  



Click image to see an enlarged view

Fig. Fig. 4: Engine oil plug location



Click image to see an enlarged view

Fig. Fig. 5: By keeping an inward pressure on the plug as you unscrew it - oil won't escape past the threads



Click image to see an enlarged view

Fig. Fig. 6: Removing the oil filter with oil filter wrench



Click image to see an enlarged view

Fig. Fig. 7: Apply a light coat of oil to the rubber gasket on the oil filter before installing it



Click image to see an enlarged view

Fig. Fig. 8: Install the new filter by hand only - DO NOT USE TOOL TO TIGHTEN OIL FILTER IF POSSIBLE



Click image to see an enlarged view

Fig. Fig. 9: Removing the oil cap on the valve cover



Click image to see an enlarged view

Fig. Fig. 10: Adding oil to the engine

 
label.common.footer.alt.autozoneLogo