Chevrolet Full Size Cars 1979-1989

Engine

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OIL LEVEL CHECK





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Fig. Fig. 1 The engine oil level is checked using the dipstick located on the side of the block, near an exhaust manifold



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Fig. Fig. 2 For an accurate reading wipe the dipstick clean with a rag, then re-insert it into the guide tube



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Fig. Fig. 3 To maintain a proper oil level, make sure it reads between the ADD and FULL marks on the dipstick



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Fig. Fig. 4 On most engines, oil is added through opening in the valve cover



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Fig. Fig. 5 Using a clean funnel will help eliminate both mess and waste

Every time you stop for fuel, check the engine oil making sure the engine has fully warmed and the vehicle is parked on a level surface. Because it takes a few minutes for all the oil to drain back to the oil pan, you should wait a few minutes before checking your oil. If you are doing this at a fuel stop, first fill the fuel tank, then open the hood and check the oil, but don't get so carried away as to forget to pay for the fuel. Most station attendants won't believe that you forgot.

  1. Make sure the car is parked on level ground.
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  3. When checking the oil level it is best for the engine to be a 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.
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  5. Open the hood and locate the dipstick which will be in a guide tube mounted in the upper engine block just below the cylinder head mating surface. The dipstick may be located on the right or left side of the vehicle depending upon your particular engine. Pull the dipstick from its tube, wipe it clean and then reinsert it.
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  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 below the ADD mark, add oil of the proper viscosity through the capped opening in the top of the cylinder head cover (or filler tube on most Oldsmobile engines). See the oil and fuel recommendations listed earlier in this section for the proper viscosity and rating of oil to use.
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  9. Replace the dipstick and check the oil level again after adding any oil. Approximately one quart of oil will raise the level from the ADD mark to the FULL mark. Be sure not to overfill the crankcase and waste the oil. Excess oil will generally be consumed at an accelerated rate.
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OIL AND FILTER CHANGE





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Fig. Fig. 6 Use a wrench or a socket to loosen the oil pan drain plug



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Fig. Fig. 7 By keeping inward pressure on the plug as you unscrew it, oil won't escape past the threads until it is withdrawn from the pan



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Fig. Fig. 8 Use an oil filter wrench to loosen, but not to install a filter



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Fig. Fig. 9 Coat the new oil filter gasket with clean engine oil



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Fig. Fig. 10 Install the new oil filter by hand

If the vehicle is operated on a daily or semi-daily basis and most trips are for several miles (allowing the engine to properly warm-up), the oil should be changed a minimum of every 12 months or 7,500 miles (Diesel interval is 5,000 miles), whichever comes first.

If however, the vehicle is used to tow a trailer, is made to idle for extended periods of time such as in heavy daily traffic or if used as a service vehicle (police, taxi, delivery) or the vehicle is used for only short trips in below freezing temperature, the oil change interval should be shortened. Likewise, if your vehicle is used under dusty, polluted or off-road conditions, the oil should be changed more frequently. Under these circumstances oil has a greater chance of building up sludge and contaminants which could damage your engine. If your vehicle use fits into these circumstance, as most do, it is suggested that the oil and filter be changed every 3,000 miles or 3 months, whichever comes first.

Oil should always be changed after the engine has been running long enough to bring it up 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. The oil drain plug is located on the bottom of the oil pan (bottom of the engine, underneath the car). The oil filter is located on the right side of the inline 6-cylinder engine and on the left side of all other engines. To change the oil and filter:

  1. Run the engine until it reaches normal operating temperature.
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  3. Raise the front of the vehicle and support it safely using a suitable pair of jackstands.
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  5. Slide a drain pan of a least 6 quarts capacity under the oil pan. Wipe the drain plug and surrounding area clean using an old rag.
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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. Loosen the drain plug using a ratchet, short extension and socket or a box-wrench. Turn the plug out by hand, using a rag to shield your fingers from the hot oil. By keeping an inward pressure on the plug as you unscrew it, oil won't escape past the threads and you can remove it without being burned by hot oil.
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  3. Quickly withdraw the plug and move your hands out of the way. Allow the oil to drain completely in the pan, then install and carefully tighten the drain plug. Be careful not to overtighten the drain plug, otherwise you'll be buying a new pan or a replacement plug for stripped threads.
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Although some manufacturers have at times recommended changing the oil filter every other oil change, we recommend the filter be changed each time you change your oil. The added benefit of clean oil is quickly lost if the old filter is clogged. The added protection to your engine far outweighs the few dollars saved by using a old filter.

  1. Move the drain pan under the oil filter. Use a strap-type or cap-type filter wrench to loosen and remove the oil filter from the engine block. Keep in mind that it's holding about one quart of dirty, hot oil.
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  3. Empty the old filter into the drain pan and properly dispose of the filter.
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  5. Using a clean rag, wipe off the filter adapter on the engine block. Be sure that the rag doesn't leave any lint which could clog an oil passage.
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  7. Coat the rubber gasket on the filter with fresh oil, then spin it onto the engine by hand; when the gasket touches the adapter surface, give it another 1 / 2 - 1 / 3 turn. No more, or you'll squash the gasket and it will leak.
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  9. Refill the engine with the correct amount of fresh oil. Please refer to the Capacities chart at the end of this section.
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  11. Check the oil level on the dipstick. It is normal for the level to be a bit above the full mark. Start the engine and allow it to idle for a few minutes.
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CAUTION
Do not run the engine above idle speed until it has built up oil pressure, as indicated when the oil light goes out.

  1. Shut off the engine and allow the oil to flow back to the crankcase for a minute, then recheck the oil level. Check around the filter and drain plug for any leaks, and correct as necessary.
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