BMW 3 Series E30

since 1983-1994 release

Repair and operation of the car

- 1. Maintenance instruction
   1.1.2. Overall dimensions
   1.1.3. Driver's seat
   1.1.4. Dashboard
   1.1.5. Keys for the car equipped with an immobilizer
   1.1.6. Window regulators
   1.1.7. Safety cushions
   1.1.8. On-board computer
   1.1.9. Indexes
   1.1.10. Voltmeter
   1.1.11. Tachometer
   1.1.12. The counter of the total passable way
   1.1.13. Sound signal
   1.1.14. 3-staged automatic transmission
   1.1.15. 4-staged automatic transmission
   1.1.16. Mechanical transmission
   1.1.17. Emergency brake
   1.1.18. Car running in period
   1.1.19. Fuel
   1.1.20. Threefold catalytic converter
   1.1.21. Engine oil
   1.1.22. Brakes
   1.1.23. Rules of placement of freight in a luggage carrier
   1.1.24. Launch of the engine and driving
   1.1.25. Methods of driving
   1.1.26. Towage of the trailer
   1.1.27. Actions at refusal of launch of the engine
   1.1.28. A start order from the additional battery
   1.1.29. If the engine decayed during the movement
   1.1.30. Actions at an engine overheat
   1.1.31. Actions at a wheel puncture
   1.1.32. Rules of towing
   1.1.33. Check of pressure in tires
   1.1.34. Check of a state and replacement of tires
   1.1.35. Shift of wheels
   1.1.36. Installation of winter tires and chains
   1.1.37. Check of an external condition of the battery
   1.1.38. Battery charging
   1.1.39. Specifications
+ 2. Maintenance
+ 3. Engine
+ 4. Cooling system
+ 5. Heating and ventilation
+ 6. Fuel system
+ 7. Exhaust system
+ 8. Transmissions
+ 9. Coupling
+ 10. Brake system
+ 11. Running gear
+ 12. Body
+ 13. Electric equipment
+ 14. Useful tips


1.1.21. Engine oil


Purpose of oil of the engine

Oil in the engine is intended for lubricant of the rubbing details and decrease in temperature at friction. Oil plays an important role at maintenance of operability of the engine.

Oil consumption

The small consumption of oil in use of the serviceable engine is allowed. The raised oil consumption the engine is caused by the following reasons.

Oil provides lubricant of pistons, piston rings and cylinders. Between the piston and the cylinder there is an oil film which the piston perceives at the movement down at a step of an admission or the working course. When braking the engine creates depression because of which there is a suction of an oil film and oil on cylinder walls in cylinder volume, and further oil burns down at influence of the heated gases in the course of combustion.

Oil is also used for lubricant of cores of inlet valves. A quantity of oil is sucked in in the combustion chamber and burns down together with fuel. High-temperature exhaust gases also burn up oil which arrives for lubricant of cores of final valves.

The consumption of oil depends on viscosity of oil, its quality and conditions of driving of the car.

The consumption of oil increases at a high speed of the movement and at frequent dispersals and accelerations.

Oil consumption the new engine above as occurs extra earnings of pistons and rings to walls of cylinders.

Normal consumption of oil – no more than 1 l on 1000 km.

When checking level of oil keep in mind that because of oil fluidifying it is difficult to determine true level.

For example, if on the car the repeating short trips are made, and the consumption of oil is normal, then after the run of 1000 km and more on the probe falling of level will not be observed at all. It is connected with the fact that oil is gradually diluted by fuel or moisture because of what an impression is made as if the oil consumption in general is absent.

If then the trip with a high speed is made, then there is a strengthened evaporation of the components diluting oil and an impression is made as if the consumption of oil is higher than norm.