2007-2009 Suzuki LTZ90 factory service manual, Page 44Get this manual
PERIODIC MAINTENANCE
OIL PRESSURE CHECK
Check the engine oil pressure periodicallyThis will give good indication of the condition of the moving partsOil pressure: 10 40 kPa (0.1 0.4 kgfcm, 1.4 5.7 psi) at 000 rmin, Oil tempat 60 (140 F) If the oil pressure is lower or higher than the specification, the following causes may be consideredLOW OIL PRESSUREClogged oil filterOil leakage from the oil passageDamaged O-ringDefective oil pumpCombination of the above items HIGH OIL PRESSUREEngine oil viscosity is too highClogged oil passageCombination of the above items