Dometic TEC 40D User Manual

Every 8-15 operating hours, or before each 
daily startup

Check oil level
Check combustion and cooling air intake zone.

Every 250 operating hours

Change engine oil (In any case at least once a year)
Check and adjust valve clearances.
Clean cooling air area.
Check screw connections.
  

Every 500 operating hours

Change fuel filter element.
Dry-type air cleaner maintenance.

Every 1000 operating hours

Clean the oil filter

Once a year

Vibration-proof fixing point