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The crankshaft rear oil seal is slightly leaking. Should it be repaired?
If the crankshaft rear oil seal is only slightly leaking, it does not need to be repaired. The following is information about crankshaft rear oil seals and commonly used materials:

An oil seal, also known as a shaft seal, is a device used to prevent fluid (usually lubricating oil) from leaking from a joint (usually the joint surface of a part or a rotating shaft). Oil seals are generally divided into monotype and assembly type, of which the assembly type oil seal is the skeleton and lip material can be freely combined, generally used for special oil seals. The representative form of the oil seal is TC oil seal, which is a rubber completely covered with a self-tightening spring double lip oil seal, generally referred to as the oil seal usually refers to the TC skeleton oil seal.

The commonly used materials for oil seals are nitrile rubber, fluorine rubber, silicone rubber, acrylic rubber, polyurethane and polytetrafluoroethylene.