Yeah this has unfortunately been an issue for a couple years now it feels. I found one method that I think works by only flying the aircraft from a hot ground start. only cowl flaps I close are the engine and I turn the intercooler open all the way. The oil cooler is open all the way by default and I don’t touch it. Not even once. I did this a couple times in single player so far and had 0 issues except one. For some reason the engine degraded issue will happen once I reach 26,000 feet in cruise for some reason. So far all of my testing has been with the boost connected to the throttle. All else aside this has let me use the web continuously until it runs out without any issues and even land and refill the injection to use it again.