Engine Oil: Service and Repair

WARNING: New Or Used Engine Oil Can Be Irritating To The Skin. Avoid Prolonged Or Repeated Skin Contact With Engine Oil. Contaminants In Used Engine Oil, Caused By Internal Combustion, Can Be Hazardous To Your Health. Thoroughly Wash Exposed Skin With Soap And Water. Do Not Wash Skin With Gasoline, Diesel Fuel, Thinner, Or Solvents, Health Problems Can Result. Do Not Pollute, Dispose Of Used Engine Oil Properly.

ENGINE OIL SPECIFICATION

CAUTION: Do not use non-detergent or straight mineral oil when adding or changing crankcase lubricant. Engine failure can result.

API SERVICE GRADE CERTIFIED

Fig.4 Engine Oil Container Standard Notations:

Use an engine oil that is API Service Grade Certified. MOPAR provides engine oils that conform to the latest recommended service grades. Standard engine oil identification notations have been adopted to aid in the proper selection of engine oil. The identifying notations are located on the label of engine oil plastic bottles and the top of engine oil cans.

SAE VISCOSITY

Fig.5 Temperature/Engine Oil Viscosity:

An SAE viscosity grade is used to specify the viscosity of engine oil. SAE 10W-30 specifies a multiple viscosity engine oil. Engine oils also have multiple viscosities. These are specified with a dual SAE viscosity grade which indicates the cold-to-hot temperature viscosity range. Select an engine oil that is best suited to your particular temperature range and variation.

ENERGY CONSERVING OIL
An Energy Conserving type oil is recommended for gasoline engines. They are designated as either ENERGY CONSERVING or ENERGY CONSERVING II.

CRANKCASE OIL LEVEL INSPECTION

CAUTION: Do not overfill crankcase with engine oil, oil foaming and oil pressure loss can result.


The engine oil level indicator (Dipstick) is located at the right rear of both 2.5L engines and 4.0L engines. Inspect engine oil level approximately every 800 kilometers (500 miles). Unless the engine has exhibited loss of oil pressure, run the engine for about five minutes before checking oil level. (checking engine oil level on a cold engine is not accurate.

Fig.6 Engine Oil Dipstick 2.5L Engine:

Fig.7 Engine Oil Dipstick-4.0L Engine:

To ensure proper lubrication of an engine, the engine oil must be maintained at an acceptable level. The acceptable levels are indicated between the ADD and SAFE marks on the engine oil dipstick:
1. Position vehicle on level surface.
2. With engine OFF, allow approximately ten minutes for oil to settle to bottom of crankcase, remove engine oil dipstick.
3. Wipe dipstick clean.
4. Install dipstick and verify it is seated in the tube.
5. Remove dipstick, with handle held above the tip, take oil level reading
6. Add oil only if level is below the ADD mark on dipstick.

ENGINE OIL CHANGE
Change engine oil at mileage and time intervals described in Maintenance Schedules.
Run engine until achieving normal operating temperature.
1. Position the vehicle on a level surface and turn engine off.
2. Hoist and support vehicle on safety stands.
3. Remove oil fill cap.
4. Place a suitable drain pan under crankcase drain.
5. Remove drain plug from crankcase and allow oil to drain into pan. Inspect drain plug threads for stretching or other damage. Replace drain plug if damaged.
6. Install drain plug in crankcase.
7. Lower vehicle and fill crankcase with specified type and amount of engine oil described in this section.
8. Install oil fill cap.
9. Start engine and inspect for leaks.
10. Stop engine and inspect oil level.

ENGINE OIL FILTER CHANGE

Filter Specification

CAUTION: Do not use oil filter with metric threads. The proper oil filter has SAE type 3/4 X 16 threads. An oil filter with metric threads can result in oil leaks and engine failure.

All Jeep engines are equipped with a high quality full-flow, throw-away type oil filter. Chrysler Corporation recommends a Mopar or equivalent oil filter be used.

Oil Filter Removal
1. Position a drain pan under the oil filter.
2. Using a suitable oil filter wrench loosen filter.

Fig.8 Oil Filter-2.5L Engine:

Fig.9 Oil Filter-4.0L Engine:

3. Rotate the oil filter counterclockwise to remove it from the cylinder block oil filter boss or filter adapter housing.
4. When filter separates from adapter nipple, tip gasket end upward to minimize oil spill. Remove filter from vehicle.
5. Make sure old gasket comes off with oil filter. With a wiping cloth, clean the gasket sealing surface of oil and grime.

Oil Filter Installation
(l) Lightly lubricate oil filter gasket with engine oil or chassis grease.

Fig. 10 Oil Filter Sealing Surface-Typical:

2. Thread filter onto adapter nipple. When gasket makes contact with sealing surface hand tighten filter one full turn, do not over tighten.

Used Engine Oil Disposal
Care should be exercised when disposing used engine oil after it has been drained from a vehicle engine. Refer to the WARNING at beginning of this section.