BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Types of Service


The 2 types of service are OIL and INSPECTION. Each indicates what is to be done to the vehicle to satisfy the service needs.


The oil service is fairly obvious in its nature. The vehicle is telling you it needs to have the oil changed; this is a requirement. There should be other items checked during the oil service to ensure a long vehicle life and proper operation. Regardless of what the Service Indicator says, do not exceed 10,000 miles between oil changes.

Change the oil and filter while at operating temperature.
Reset the Service Indicator

At the time of the oil service, the following operations should be performed:

Check the steering linkage, box, flexible joint coupling, oil level and all connections.
Check the brake pads, rotors, hoses, connections, parking brakes and cables.
Check tires for pressure and tread wear patterns.
Check all lights, headlights and aim, warning indicators, turn signals, back-up lights, glove and map lights, and check the operation of the horns.
Check wipers, washer fluid level and spray pattern. Check the intensive washer fluid level.
Check the seatbelts for damage.
Clean the cassette player heads, pinch roller and capstan.
Road test.
Clean injectors, if necessary.
Wash and clean the interior and exterior of the vehicle.


There are 2 inspection services aptly named Inspection I and Inspection II. They are performed alternately. Keep records of when an inspection is done, so the proper inspection can be completed when due.

Required Services

Check for any diagnostic codes.
Check valve clearance and adjust if necessary on M20 and M30 engines.
Check coolant level, concentration and for leaks. Replace every 2 years.
Check steering gear for leaks and maintain fluid level.
Check brake and clutch fluid level. Change fluid at least every 2 years.
Check washer fluid and intensive washer fluid level.
Check battery electrolyte level.
Check operation of air conditioning system.
Clean and lubricate all bearing points of the throttle linkage.
Reset the Service Indicator.
Change the oil and filter while at operating temperature.
Check for leakage at the transmission and differentials.
Change the automatic transmission fluid.
Check the fuel tank and lines for damage and leaks.
Check exhaust system for damage and leaks.
Check steering for free-play and centering.
Check the brake pads, rotors, calipers and emergency brake.
Check the tightness of the M5 wheel air vane ring bolts, 6 ft. lbs. (8 Nm).
Check steering linkage and suspension components.
Check tire condition and pressure.
Check wipers.
Check seatbelts.
Lubricate all body hinges, catches and latches.
Check all lights and headlight aim.
Check hydraulic fluid level on self leveling suspension with the suspension fully lifted.
Change the microfilter for the ventilation system.
Road test.


All items in Inspection I.
Check the condition and tension of all drive belts. Tension the belts if necessary, except the serpentine belt on the M50 engine.
Replace the spark plugs. Not to exceed 40,000 miles between changes.
Check the automatic transmission fluid level.
Every other Inspection II or every 4 years, whichever comes first, replace the timing belt on the M20 engine.
Replace the air filter or every 2 years, whichever comes first. Replace more often if needed. Not to exceed 40,000 miles between changes.
Replace the ASC+T inlet filter (535i with ASC+T).
Change manual transmission lubricant.
Change transfer case lubricant (325iX).
Change rear differential lubricant.
Change front differential lubricant (325iX).
Check CV joint boots.
Check parking brake linings.
Replace fuel filter. Not to exceed 40,000 miles between changes.
Check clutch disc.
Check condition of body structure.

Additional Services

The oxygen sensor must be replaced every 50,000 miles, except on the 1993 318i and 325i. The oxygen sensor should be changed every 60,000 miles on the 318i and every 100,000 miles on the 325i. This is to ensure proper operation of the engine management system and to keep emissions to a minimum. This maintenance interval is a strictly mileage based interval as driving habits and time do not affect the deterioration of the oxygen sensor.