A. Check if there is no oil or the oil level is too low. Refueling is necessary, but excessive refueling is not allowed.
B. Oil filter is blocked. Replace the oil filter.
C, oil valve failure, spool stuck, remove and check.
D. The filter element of the oil and gas separator is blocked or the resistance is too large. Remove and check or replace it.
E. The oil cooler surface is blocked and checked, and cleaned if necessary.
