I have 1991 Mitsubishi lancer i have oil leak at back of motor my repairer said i have leaking head gasket i have no overheating problems or water problems what do you think?

Hi

A head gasket can leak oil

without causing overheating problems.

If the gasket has blown between an oil gallery

and the outer edge of the head

it will show as the problem that you are having.

best wishes