pulled the lower unit to check my impeller and when I pulled the shaft from the lower unit the oil on the shaft looked very foamy. I changed the oil a week earlier and didn't change out the o-rings that go on the fill and drain plugs. I am going to address this first and then recheck the oil but if they turns out to not be the cause of water leaking into the L/U where should I look next? Also Will the prop shaft seal not work if the prop nut is not torqued to spec? Thanks