Hello. I have a 1957 Mercury Mark 25 and I am wondering what the best oil mix is for this motor. I have been running it at 32 to 1 using Quicksilver oil and non-ethanol gas. I have a 1962 shop manual that states it can be operated at 50:1 using Quicksilver oil. What is the current accepted oil ratio given modern gas and oil? Thanks.
fastjohn US Member - 2 Years Replies: 147 Topics: 42