In every application I have seen, synthetic oil seems to have no negative effects and usually has benefits. Ok, this thread is getting off course, but I will step in here and put in my two cents worth. I'll stick to non-synthetics, because I've seen what synthetics will do to an engine. The comment about mixing 40:1 oil at 50:1 oil means that if the label on the bottle says to mix the oil at 40:1-and you mix it at 50:1-you risk cooking your engine. I've seen 50cc engines run at 50:1 and 100:1 on synthetics and they look like someone threw sand in the intake after only 20-30 gallons. I expect this engine to go well over 250 gallons before I might think about replacing the rings. There is barely enough carbon in the combustion chamber to even scrape out. The piston skirt doesn't show signs of scuffing. I've got a 52cc airplane engine here that I've run 126 gallons through on non-synthetic oil at 40:1 and it looks beautiful inside. I've seen the pitted pistons, and burnt rings. I've seen all the piston skirt scuffing and carbon build up from using synthetics. You do what you want, but unless you have actually SEEN the insides of a 2-stroke engine after being run on synthetic oil for a couple hundred gallons-then your just repeating what you've heard and read someplace else. I have seen the insides of enough 2-strokes to know that synthetics don't hold up as well under punishing conditions as non-synthetics. I see the insides of engines all the time. Weed eaters, chainsaws, snow blowers, lawn mowers, airplane engines are all air cooled. You can run just about ANY oil, so long as you mix it according to the label on the oil bottle.ĭO NOT use 2-stroke oil for boat motors. Mixing 40:1 oil at 50:1 is a good way to cook your engine. 50:1 is okay, if the oil manufacturer designed the oil to run at that ratio. Anything more than that is for really punishing conditions where circulated cooling air is minimal and engine revs are excessively high.Ĥ0:1 is usually the standard. If your not fouling plugs and getting gummed up rings or carbon deposits in the combustion chamber-then your fine. If you just run a regular old dinosaur oil in your engines, and mix it according to the label on the oil bottle-you'll not have problems. IMO-synthetics is just myth and hype to sell you more expensive oil that you don't need. I run them all on 40:1 oil and I punish the heck out of them. I will NOT use a synthetic oil in my engines. I fly model airplanes that have gasoline 2-stroke engines ranging in size from 25cc up to 100cc twins.
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