OIL LEVEL CHECK
Always maintain the engine oil at its proper level in the crankcase. Check the oil level when the engine is cold. If this is not possible, switch off the engine and wait a few minutes before checking the oil level. This will allow the engine oil time to drain into the crankcase.
To check the oil level, remove the dipstick, wipe it clean, and reinsert it. Withdraw the dipstick and observe the oil level marking. The dipstick is marked "add" and "full." The oil level should be kept between the two marks, neither below the "add" mark nor above the "full" mark. If necessary, add oil. When replacing the dipstick, be sure that it is seated firmly in its tube.
For maximum engine protection during normal operation, the crankcase oil should be drained and refilled every four months or 6,000 miles. (6 months or 7,500 miles on 1975-77 cars, 1 year or 7,500 miles on later cars). If the vehicle is driven frequently in dusty or sandy areas, is used for trailer towing, or is required to idle extensively in heavy traffic, more frequent oil changes are required. In these situations, oil change intervals should not exceed two months (3 months on 1978 and later cars) or 3,000 miles.
Drain the oil when the engine is at normal operating temperature so the warm oil can carry any foreign matter with it that might otherwise cling to the sides of the crankcase. To drain the oil, place a suitable container under the oil pan below the drain plug. Remove the drain plug and allow the warm oil to drain into the container. Remove and replace the oil filter, as discussed below.
Be sure that the oil pan is drained as completely as possible before refitting the drain plug. Fill the crankcase with oil of the recommended grade. Start the engine and check the oil level. Add sufficient oil to compensate for the oil which has been drawn into the filter.
OIL FILTER CHANGES
All engines are equipped with a full-flow oil filter, of either a cartridge or throw-away type. The filter should be replaced at every oil change.Cartridge Type Filter
To change the cartridge type filter, first drain the crankcase oil. Replace the drain plug. Place a container under the filter cartridge container to catch any oil which may be spilled. Unscrew the center bolt of the container and remove the container. Withdraw the old filter cartridge and clean out the cartridge container. Remove the old seal from the filter body casting and position the new seal in the casting. Install the new filter cartridge in the container and position the cartridge/container assembly on the filter body casting. Tighten the center bolt. Fill the crankcase with clean oil, start the engine, and check the oil level. Add sufficient oil to compensate for the oil which has been drawn into the filter.Throwaway Type Filter
To change the throwaway type filter, first drain the crankcase oil. Replace the drain plug. Place a container under the filter to catch any oil which may be spilled. Remove the old filter by unscrewing it by hand or with a special oil filter wrench. Coat the gasket of the new filter with a thin film of clean oil. Prime the filter by pouring some clean oil into it. Place the filter in position on the filter body casting and tighten the filter by hand until the sealing gaskets just make contact. Further tighten the filter by hand about one-half turn. It is not necessary to use the filter wrench to tighten the filter. Fill the crankcase with clean oil, start the engine, and check the oil level. Add oil as necessary to compensate for the oil which has been drawn into the filter.