2003 Bombardier Outlander 400 Factory Service Manual, Page 112Get this manual
Subsection 08
Section 03 ENGINE (LUBRICATION SYSTEM)
If O-ring andor rubber ring is (are) brittle, cracked or hard, replace the defective part(s)Clean both contact surfaces of oil strainer coverCheck and clean the oil inlet and outlet area for dirt and other contaminations
Refill engine at the proper level with the recommended oilRefer to TECHNICAL DATA for capacityStart engine and let idle for few minutesEnsure oil filter and magnetic drain plug areas are not leakingStop engineWait while to allow oil to flow down to crankcase then check oil levelRefill as necessary
ENGINE OIL PRESSURE REGULATOR
The oil pressure regulator is located on the engine MAG side (behind magneto housing cover)