1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 52Get this manual
PERIODIC MAINTENANCE 2-26
OIL PRESSURE
Oil pressureat normal operating temp): 300380 kPa (3.03.8 kgcm2, 4354 psi at 4000min
NOTE: The figure shown above is guideline only, not an absolute service limitIf oil pressure is lower or higher than specification, the following causes may be considered(See page 6-66 for oil passage locations) Low oil pressure Clogged oil filter Leakage from oil passages Defective oil pump Defective oil pressure regulator Damage O-ring Combination of above itemsHigh oil pressure Using an engine oil of too high viscosity Clogged oil passage Clogged oil pressure regulator Combination of above items