Has any had an oil leak on the filter side of a kawasaki 23 horse power? The last 2 times I have changed oil I have noticed this. It get a little oil build up above the filter on the fins of the motor and on the the filter. dust and fine grass stick to this area. I cleaned this area after last oil and filter change and after 50 hrs. the slight leak is there. More annoying than anything. The engine has 400 hours and I would like to fix problem.