I am currently running 40:1 with 91 octane fuel. The oil I am using it the standard Stihl 2 stroke oil, in the orange bottles. I tend to run my mixes a little heavier on oil because I look at oil as being cheap insurance for my equipment. I use that thought especially since all of my mowers are 2 stroke Lawn Boys and you can't buy a new 2 stroke Lawn Boy anymore. I need the 2 stroke mower because of the steep terraces that I have. I also add Sta-Bil and Seafoam to my fuel cans. I have always noticed a difference in my used equipment when I started adding Seafoam. The P&C that I am running is a Farmertec kit. I spent $75 on the kit, because it was the cheapest kit I could find that had all the parts, but the crank bearings, that actually stated that it was Nikasil lined. There were a couple of cheaper kits, but none of them specifically stated that they were Nikasil lined. I even messaged several of the sellers of the cheaper kits, asking if they were Nikasil lined and never heard from any of them. The kit that I bought, the seller was great to communicate with. The kit was from ebay. I think it has dropped in price since I bought it. The cheapest full engine kit on ebay that I could find, that also stated that it was Nikasil lined, I think was about $110. But like I said before, I also like knowing how to completely tear into my equipment and work on them. I also have an aftermarket carb for my 029 Super farmboss, of which now has the 039/390 top end on it. I bought it so that I could have a second carb for it. I have also done the MM to it. My original main bearings were fine, but they had the plastic bearing cages and I know they are known for failing. It cost me $12 with shipping, for 2 brand new SKF 6203/C3 bearings, so that I knew what I had. The bearings were easy to replace anyways and while I was in, why not do them.