FNM HPE Series Owner's Manual page 130

Possible Fault
If the oil pressure is low
Oil level too low.
Excessive inclination of engine.
Oil pressure apparently too low due to faulty oil pressure
switch, sensor or meter.
Incorrect lube oil SAE class or quality for ambient
temperature.
Oil leaks .
Clogged oil filter
Faulty oil pump
If the oil consumption is excessive
Oil level too high.
Excessive inclination of engine.
Insufficient comburent air.
Incorrect lube oil SAE class or quality for ambient
temperature.
Engine overloaded.
Leak in lubricating oil system.
Oil steams condenser clogged .
Turbocharger oil leaks .
126
Possible Remedy
Raise the level.
Check / Adjust.
Check /replace
Replace.
Check /replace
Replace.
Repair / replace.
Reduce the level.
Check / Adjust.
Check .
Replace.
Check size of propeller.
Repair / replace.
Replace
Replace or repair.
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FNM HPE Series