4. LUBRICATION SYSTEM DOWNTOWN 125i SERVICE INFORMATION GENERAL INSTRUCTIONS · The maintenance of lubrication system can be performed with the engine installed in the frame. · Drain the coolant before starting any operations. · Be careful when removing and installing the oil pump not to allow dust and foreign matters to enter the engine and oil line. · Do not attempt to disassemble the oil pump. The oil pump must be replaced as a set when it reaches its service limit. · After the oil pump is installed, check each part for oil leaks. SPECIFICATIONS Unit: mm Standard Inner rotor-to-outer rotor clearance 0.15 Outer rotor-to-pump body clearance 0.150.2 Rotor end-to-pump body clearance 0.040.09 ENGINE OIL At disassembly: 1.2 liter Engine Oil Capacity At change: 1.0 liter Recommended Oil SAE15W40 API: SJ TROUBLESHOOTING Oil level too low Poor lubrication pressure · Natural oil consumption · Oil level too low · Oil leaks · Clogged oil filter or oil passage · Worn piston rings · Faulty oil pump · Worn valve guide · Worn valve guide seal Oil contamination · Oil not changed often enough · Faulty cylinder head gasket · Loose cylinder head bolts 4-2