2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 153Get this manual
Engine Lubrication System:
Diagnostic Information and Procedures
Engine Lubrication Symptom Diagnosis
Possible cause Insufficient amount of engine oilDefective oil pumpClogged oil circuitIncorrect engine oilExhaust smoke is dirty or Excessive amount of engine oilthick Engine lacks power Excessive amount of engine oilCondition Engine overheats
B827H21504001
CorrectionReference Item Check level and addReplaceCleanChangeCheck level and drainCheck level and drain4) Install the oil pressure gauge to the main oil gallery
Oil Pressure Check