Engine and exhaust system
The following maintenance items should be carried out as scheduled:
Engine: Check oil level.
Engine: Oil change, replace oil filter and bypass filter.
Engine: Visual leak test.
Engine: Adjust valves.
Engine (models since 9/89): Tighten the cylinder head bolts.
Engine: Tighten intake and exhaust manifold bolts.
Cooling and heating system: Check coolant level. Check the concentration of antifreeze agent. Visually check the radiator for leaks and external contamination.
Cooling and heating system: Replace the cooling concentrate.
Petrol engine: Check idle speed and CO content.
Injection engine: Check throttle position sensor, adjust if necessary.
Ignition system: Check ignition timing, adjust if necessary.
Petrol engine: Check spark plugs, replace if necessary.
Fuel filter: Replace.
V-belt: Check tension and condition.
Toothed belt: Replace.
Dry air filter: Replace filter element.
Exhaust system: Check for damage.