Dodge Omni/Horizon/Rampage 1978-1989 Repair Guide

Engine

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FLUID RECOMMENDATIONS



Oils and lubricants are classified and graded according to standards established by the Society of Automotive Engineers (SAE), American Petroleum Institute (API), and the National Lubricating Grease Institute (NLGI).



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Fig. Fig. 1 Oil viscosity chart-1978-87 models

Oils are classified by the SAE and API designations, found on the top of the oil can, such as SAE 5W-30, SAE 10W-30, etc. The SAE grade number indicates the viscosity of engine oils. Chrysler prefers the use of SAE 5W-30 for when minimum temperatures consistently fall below -10°F (-23°C). Chrysler does not recommend the use of SAE 5W-30 and 5W-40 in turbocharged engines in ambient temperatures above 60°F (15°C). or the use of SAE 10W-40 or SAE 10W-50 in any of their 1988-89 vehicles.



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Fig. Fig. 2 Oil viscosity chart-1988-89 models

The API classification system defines oil performance in terms of usage. Only oils designed for service SF or SF/CD, SG or SG/CD should be used. These oils provide sufficient additives to give maximum engine protection.

OIL LEVEL CHECK



The engine oil dipstick is located on the radiator side of the engine. Engine oil level should be checked weekly as a matter of course. Always check the oil with the car on level ground and after the engine has been shut off for about five minutes.



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Fig. Fig. 3 The engine oil dipstick is located on the radiator side of the engine, pull it out to check the level

The oil level may read at the top of the full range after the car has been standing for several hours. When the engine is started, the level will drop, due to oil passages filling, but the level should never be allowed to remain below the ADD mark.

  1. Remove the dipstick and wipe it clean.
  2.  



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Fig. Fig. 4 After removing the dipstick, wipe it clean and reinsert it

  1. Reinsert the dipstick.
  2.  
  3. Remove the dipstick again. The oil level should be between the two marks. The difference between the marks is one quart.
  4.  



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Fig. Fig. 5 Remove the dipstick again. The oil level should be between the two marks

  1. Add oil through the capped opening on the top of the valve cover.
  2.  



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Fig. Fig. 6 If necessary, add the oil through the opening of the valve cover.

  1. After inserting oil, recheck the level again.
  2.  

OIL AND FILTER CHANGE



Under normal service, the engine oil and filter should be changed every 12 months or 7500 miles (12,067 km), whichever comes first.

Under the following conditions, change the engine oil and filter every 3 months or 3000 miles (4827 km), whichever comes first:



Frequent driving in dusty conditions
 
Frequent trailer pulling
 
Extensive idling
 
Frequent short trip driving, less than 10 miles (16 km)
 
More than 50% operation at sustained high speeds, over 70 mph (112 km)
 


WARNING
Drain the engine oil when the engine is at normal operating temperature.



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Fig. Fig. 7 Loosen, but do not remove the drain plug



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Fig. Fig. 8 Keep inward pressure while unscrewing the plug, then quickly pull it away

To change the oil, the vehicle should be on a level surface at normal operating temperature. This ensures that you will drain away the foreign matter in the oil, which will not happen if the engine is cold. Oil which is slightly dirty when drained is a good sign. This means that the contaminants are being drained away and not being left behind to form sludge.



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Fig. Fig. 9 Remove the oil filter with a strap wrench



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Fig. Fig. 10 Before installing a new oil filter, coat the rubber gasket with clean engine oil

You should have available some means to support the car, a 1 / 2 in. (13 mm) wrench, a filter wrench, 4 quarts of oil, a drain pan and some rags.

  1. Jack up the front of the car and support it.
  2.  
  3. Position the drain pan under the drain plug, which is located at the rear of the oil pan.
  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. Loosen, but do not remove the drain plug. Cover your hand with a heavy rag and slowly unscrew the drain plug. Pushing the plug against the threads in the oil pan will prevent hot oil from running down your arm. As the drain plug comes to the end of the threads, quickly pull it away and allow all of the oil to drain into the pan.
  2.  
  3. When all the oil has drained, replace the drain plug and tighten it.
  4.  


WARNING
Be sure to dispose of the old oil in an environmentally safe manner.

  1. Remove the oil filter. It can only be removed with the tools shown, from below the car. Once the filter is loose, cover your hand with a thick rag and spin it off by hand.
  2.  


WARNING
On May 29, 1979, the assembly plant began installing 4 in. (101mm) diameter oil filters in place of the previously used 3 in. (76mm) diameter filters. The 4 in. (101mm) filters are the same as those used on other Chrysler vehicles and should be used for service.

  1. Coat the rubber gasket on a new filter with clean engine oil and install the new filter. Tighten it by hand until the gasket contacts the mounting base and then 3 / 4 -1 turn further.
  2.  
  3. Refill the engine with 4 quarts of fresh oil of the proper viscosity according to the anticipated temperatures before the next oil change.
  4.  


WARNING
It requires 4 quarts of oil to fill the engine regardless of whether the filter was changed or not.

  1. Run the engine for a few minutes and check the oil level.
  2.  

 
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