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wouldnt worry about it, changed mine at 89k, previouslt done at 65k, was quiote contaminated but it is kinda enevitable and not worth worrying about as a bit of dirt and oil happens, just change the belt
oil can contaminate the belt/cause it to disintigrate and make it snap etc. if there is a visible amount of oil i would find the leak and fix it. most likely be a crank or cam seal.