I am religious when it come to changing oil in my car and I always put my used oil in back in the 5 quart refill jugs. With that said I always use Mobile 1 full synthetic. I have a that we nick named "stinky" you can guess why because of the smoking it does while running , not just starting either this thing will leave a smoke screen clear around the house. So that also made this tractor an oil consumer. I got to thinking if this this is just going to burn it out anyway I can use my old synthetic through it I got a 5 quart jug to use up...
Well after weeks of using this tractor I have noticed the smoking is less and its starting better. It puffs now a bit when I start it but goes away almost immediately, I am only getting a small puff every now and then when the idle or throttle changes. Oil consumption is also going down. a long session with this thing was burning up to 1/2 quart if you can believe that, now its about half that 1/4 quart or a few glug glug glugs to top it off. This oil change thing started this summer and although I knew it was making the tractor consume less and start better. Its been though the whole oil change jug of used oil (i have more).
This fall when II was doing my oil changes in my WH and my other sears I decided that I will run them on synthetic so bought them the same thing I use in my cars Mobile 1 European formula 0-40. Now that I am reading that people will throw a 100w lamp on their tractor that cost about .75-1.00 a day I think I prefer to go to the cheaper route and stick with a quality oil.
I was not sure if I should try and swap these old engines over to synthetic I am no rocket scientist or know it all but I am a certified mechanic and my brain was telling me that synthetic was not going to hurt these old engines. This engine was on its last limb and I could care less if it broke at the time because I was thinking of engine swapping it. Now that it only puffs at start up and runs great I have found that if it never goes past 1/2 throttle I have almost no oil consumption so it does not mow any more it has become a full time plow. I gave it a clean (new oil) change with the other two because I really don't like using old oil in it I just did not care at the time its what I had and the engine was limping.
This is "stinky"