Parts for your 2004 Mitsubishi Lancer-Oil seals

2004 Mitsubishi Lancer oil seals: what they do and when to replace

Oil seals are absolutely used on the 2004 Mitsubishi Lancer. Mitsubishi’s factory Service Manual for the CH/CS series (2003–2007) specifies front and rear crankshaft oil seals, camshaft seals, and transaxle/drive‑shaft output seals for the 4G18/4G93/4G94 engines and F5M42/F4A4x gearboxes. The Mitsubishi ASA electronic parts catalogue likewise lists those seals as replaceable service parts. That means any engine or gearbox oil seen outside its housings has passed a failed seal, not a designed vent.

In a nutshell, oil seals keep lubricants in and grit out, so rotating shafts can spin for years without chewing out bearings. Up front, the crank seal sits behind the harmonic balancer