Gasoline engines
- Use only unleaded gasoline.
- Starting a gasoline engine by pushing or towing is allowed only on one attempt and at a distance of not more than 50 m. It is better to use an auxiliary cable for this purpose. Unburned fuel, if ignited, can overheat the catalytic converter and destroy it. When the engine is warm, push starting is not allowed.
- If it is difficult to start the engine, do not turn on the starter for too long. In this case, continuous fuel injection is performed. It is necessary to identify and eliminate the cause of the malfunction.
- Never run out of fuel in a gas tank.
- If misfiring occurs, do not increase the engine speed and repair the problem immediately.
- Use only spark plugs approved by BMW.
- Do not test for spark with the spark plug plug disconnected.
- Do not test cylinder operation by turning off the ignition of any cylinder. When either cylinder is turned off, unburned fuel enters the catalytic converter.
Gasoline and diesel engines
- Do not park your vehicle over dry leaves or grass. The exhaust system around the catalytic converter is very hot and radiates heat even after the engine has stopped.
- Do not apply any underbody protector to the exhaust system components.
- Do not modify the design of the heat shields.
- When filling the engine with oil, pay particular attention not to exceed the level indicated on the gauge as Max. Excess oil from incomplete combustion enters the catalytic converter and can damage its alloy metal coating or completely destroy the catalytic converter.