Pursuant to earlier posts regarding the perennial debates about oil, today I put in a new oil filter and added Amsoil Flush, ran according to instructions, then dropped oil, changed to a new filter again, and replenished with Amsoil 15-40.
BTW, this is in a '79 non-turbo 300D with 200K.
Everything is running smoothly, albeit idle now a little high with idle manual throttle closed, and I intend to extend my drain interval from 2,500 to 5,000-6,000 miles, but am considering changing filters at 2,500-3,000. Does anyone have any strong opinions on any of this? Should I adjust my injector for the idle?
Thanks again.