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4. Oil pressure lowered
Check if oil pressure
gauge indicates wrongly
Check oil amount
Normal
Normal
Normal
Normal
Check cooling
temperature
Inspect oil quality
Check oil relief
valve
Retighten
Replace
Disassemble
engine
Too high
Refer to engine overhea
Water & fuel mixed
in oil
Disassemble engine
or injection pump
Improper
Replace with
recommended oil
Too low
Use recommended oil
(replenish)