John Posted November 20, 2016 Report Share Posted November 20, 2016 Hi all, There seems to be quite a bit of confusion about a new Avgas specification that is now available. Many Airports and FBO's are now selling Unleaded Avgas (94UL Avgas). This is a dream come true for anyone with a Rotax engine. All the benefits of Avgas without the lead containment. Avgas is not Mogas. Avgas is designed for aircraft, Mogas for cars. We have been using Mogas as a compromise in order to avoid the high lead content contained in 100LL Avgas. Avgas has a lower vapor pressure, a much better gum index and never contains ethanol. Avgas is designed for a long storage life in our vented fuel tanks, while Mogas is designed for a sealed automobile fuel tank. Also, 94UL does not contain the offending blue or yellow dye that many of us have staining our wings. Instead it is non-offending aromatic. An additional benefit for CT owners is that 94UL avgas will not turn the sight tubes yellow, or dark. It will not gum up carbs like Mogas will. And yes, you can still do 100hr oil changes with 94UL as it contains no lead. I would urge all of you to purchase and use 94UL Avgas as much as possible for your benefit, and to encourage availability. Unleaded Avgas can now be found at the following airports, with more being added all the time: https://swiftfuels.com/ul94-map/ On another note, one CT owner remarked that he is getting fuel leaks at his sump drain when using Avgas, this is because Avgas will not cause rubber seals to swell like Mogas will. If this happens to you, this is an indicator that a seal or gasket may need to be replaced. Happy Flying, John Link to comment Share on other sites More sharing options...
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