I have a '93 KA24E with 128,000 miles. I wouldn't reccomend doing any of the "flushes" to it either. I would stick with the regular maintenance such as filters, lubes and not venture into the "flush" realm. The only thing I flush is my radiator and that's only every 30,000 miles. I also agree that the worst thing you can do is flush an automatic transmission. My buddy took his Lincoln to get a flush. I warned him against it, but he wouldn't listen. Two weeks later and a couple of thousand miles away from home on vacation the tranny gave up. So, I think you're doing the right things as far as regular maintenance. Stick with your regular service and avoid all the "exotic" things your lube guy just wants to bill you for. I wouldn't worry about the brake fluid. Draining it will just cause you air problems. I would reccomend changing your rear end oil if you haven't done that. A good synthetic will work great for the differential. As far as your engine oil. I live in Mississippi and it's hot all the time. lol I can't help you on the different grades for different temps. I use 10w-30 year around. Good luck and I'm sure your little truck will be around for a long time to come.
