Maybe I didn't say it in quite so many words until a day or two ago, but without going back to review exactly what I have written I believe I said I took the truck for a drive between flushes and after the final flush and fill. Taking the truck for a drive naturally gets the engine to higher RPMs, which is not replicated by simply idling it in the garage or driveway. And after that let it cool down before again topping it up. Good luck.