Suzuki DF25/DF30 Four Stroke Service Manual, Page 49Get this manual
2-22 PERIODIC MAINTENANCE
OIL PRESSURE
Oil pressureat normal operating temp): 400 500 kPa (4.0 5.0 kgcm2, 57 71 psi at 3000 rmin
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 7-62 for oil passage locations) Low oil pressure Clogged oil filter Leakage from oil passages Defective oil pump Defective oil pressure regulator Damaged 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