Oil leakage on my Jenson Cap

Dear all C hing,

I suddenly found that my Jenson copper tube (0.22u/630V) capacitor have oil leakage last night. After tested, the capactance and the function of the cap still being normal. No special noise or sound different being heard. Another one (same cap) connected in parrallel does not have this problem.

Would it be a problem??? should i replace it with a new one? what is the main cause of the breakage?

Please help!