1999 Johnson 115 leaks foot oil in the water..can see it easily when beached on sand bar. I have changed the oil but did not use new seals. I can see the drain/fill plugs and its not leaking. Mechanic told me when it sits in the sun that it swells up and overflows...I aint buying this as I have seen anything on the forum saying this. If oil gets out, then water gets in. After draining the foot oil early this summer I noticed a short burst of water draining first, then oil. I plan on getting new gaskets for drain/fill plug and checking oil again. Any other advise? Thanks!