I'm just finishing the second rinse cycle in my 94 855T winter car, it has 175K miles. It had a slight lifter issue as well as a weepy RMS. The lifter "ticking" has reduced to the point of being barely noticeable to anyone but myself and the RMS is bone dry externally. I'm not sure yet if I'll end up running M1 in it or not but overall I'm very happy with the ARX results and will be doing the maintenance program. I also have a 97 854R summer car with 68K miles that's only ever seen M1 5w-30 since around 11K miles when I got it. I'll be doing one ARX treatment with it as soon as it's on the road for the season. I'll go back to M1 with that car after the ARX treatment.
You should be fine with the 740T as long as you follow the ARX instructions. Post back if anything unusual happens while you're doing the treatment such as a low oil level light etc...