Hi all, after three years of owning my boat the seals have starting to seep fluid. just wondering the typical life span on these seals as i routinely spray WD-40 after wash down after every outing , has the wd-40 spray contributed in perishing the seals ? The other question is should i have a crack at replacing the seals myself or just get the mechanic to do it. whats the hardest part ? cheers