Home › Forum › Ask A Member › Johnson PO-15 Oil recommendations › Re: Johnson PO-15 Oil recommendations
Hi David, I have a PO15 that I fixed up to use back in the late 1980s. At that time, I really was unsure about fuel/oil ratio, so I ran it 16/1 and used Johnson/Evinrude TCW3 oil. Through the years I switched to Quicksilver TCW3. The motor has always seemed to be happy and has stayed alive. The original specs called for double this amount of oil, according to my Johnson service manual. In my opinion, I would not go any leaner than 16/1, and a little more oil wouldn’t hurt it either. The PO 15 is a tough built work horse, but it needs the oil to keep the internal bushings alive. Using modern outboard oil on your motor will cause it to ”drool” some black goo here and there, because of the detergents added to the oil. Nothing to worry about. These old motors are made to run with more oil, and will smoke.. that’s the just the way they are. Hope this helps!