"I went to all the local suppl
"I went to all the local suppliers near me and not one had 20W non detergent motor oil. I found that if you go to a plumbing supplier and ask him for pump oil for transfer pumps, etc, it is 20W non detergent oil, perfect for the old style trim systems like yours and mine. I was also told that you can mix 10W and 30W to get the same viscosity if you are stuck. I replaced the 4 outside hoses last year and now find that the ones from the pump, out thru the transom are leaking. My next project! It never ends with these 35 year old boats,lol !!"