I have used Archoil for several years in my 6.0L Powerstroke. Archoil does a great job of keeping the engine running nice and smooth.
Started using 3 years ago on 2003 6.0L when it started running rough. No problems since!
I started to use the Archoil stuff about 2 years ago, as my 7.3L was running a bit rough and making a "humping noise", especially at idle. Since then all that is gone and the engine performs as when I bought it new. My mileage runs about 20 on the highway, 18 on mixed driving and 11 towing an 8000 lbs trailer. My 7.3 now has 260K miles too. I also use the fuel additive on it and my 1997 Mustang that has a leaking injector causing it to become hard starting as the start fuel pressure dives fast. The 6200 has helped that although not solved it... I guess I need to find and replace the culprit
I have problems starting this 7.3 on my F 250, I went ahead and ordered the Archoil and put it in, still have the same problem Although no us bad it seems to run smoother and Quieter
I thoroughly love your product. Although it didnt "cure" my injector stiction in my 06 6.0l powerstroke, it did help greatly and I now only have minor stiction, to the point where I can now drive it for a good while untill I can save up for a new set of injectors. Engine noise is much quieter and runs much smoother. Will continue to use this product with every oil change.