Will oil in transom cause rot or not?
 

When I was getting my boat ready for the year last year I had to bleed the trim tabs because one of them would not hold pressure. I found oil coming out thru the top of the transom on the inside. One of the hydraulic transfer tubes (Aluminum) for the trim tabs ( K planes) corroded away and was leaking oil into the transom. Would this cause the transom to rot? What should I do about the transom? I replaced the tubes with a stainless one and the holes that did not have the coroded tubes were dry.

Re: Will oil in transom cause rot or not?
 

If oil got in there, then moisture can too. Where wood and moisture come in contact, the wood will rot.