Engine oil must first be changed every 100 hours. Then change every 400 hours.
Primary and secondary fuel filters need to be replaced every 100 hours and then every 400 hours.
Every day the frozen water should be discarded.
The outer filter should be cleaned by air every 100 hours and the outer filter should be changed every 400 hours.
First, you have to change in 100 hours. Then change every 400 hours.
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