Selecting engine oil (BMW 3 Series E46)

Oil performs several functions in the engine. The higher the engine power, the higher the demands placed on the oil. Duckhams produces premium quality oils that meet the requirements of all modern engines.

How does motor oil work

Reducing friction

Without lubrication, the rubbing surfaces in the engine will heat up, melt and quickly render the engine unusable. Oil and its special additives form a molecular layer separating the rubbing surfaces, preventing them from wearing out and generating heat.

Cooling of hot zones

Oil cools engine surfaces that coolant cannot reach, such as piston and cylinder walls, where temperatures can exceed 1000°C. Oil helps transfer this heat to the cooling system. Oil heat is also carried away by air currents in the crankcase and, in some cases, by the oil cooler.

Cleaning the internal surfaces of the engine

Oil washes away combustion products from the inner cylinder walls (i mainly sow) and carries them into the filter. Only the smallest particles remain in the oil until it is replaced.

Oil is harmful - remember this

When handling motor oil, it is important to always remember that:

• Avoid contact of motor oil with skin. Prolonged skin contact with motor oil may cause harm to health.
• Collect the used oil in a container and take it to the nearest motor pool for recycling. Never pour oil on the ground.