Just remember according to SAE 20w50 will not flow properly below 15 degrees, so not only is it important to pay close attention to the outside air temp, but also the altitude temp (Winds Aloft Chart) that you will be flying at. Otherwise, just change at a good service interval, say every 50 hours, sooner if harder use, and always change the filter at the same time.
With the exception of what Larry Flesner has personal experience about with Marvel Mystery Oil, which is based on actual measured performance/compression values, I would not run any other additives in my plane engine. Regular maintenance will do far more to protect it. Run what you are comfortable with, but in my mind if it says it sticks to metal, it will stick to ALL metal, including oil passages, etc... where you don't want it building up. Based on the chemist who wrote one of the articles, you may even hurt the performance of the chosen oil when combined with the additive. As always your results will vary.... Colin N96TA
