Why would they (manufacturers) care about 10 yo engines? They are more interested in selling new stuff.
Fuel has changed, the amount of suspended water has increased, and pumps built to run 'normal' full sulphur are now forced to digest this 'crap'.
i've yet to meet a CR owner, enthusiast, guru... that reccomends 2 stroke. This is for the good ol rotary, inline, or in my case cam fired PT Cummins. Not too different than the PD models here. Hell, even Cummins had a system that pulled oil out of the pan, and directly put it in the fuel tank. It was a batch system, and we only needed to hit the valve to refill the oil pan, and change the oil filter a couple times a year. They allowed up to 10% oil in the fuel. It worked out pretty well, most trucks had about 80-100 gallon fuel tanks, and the oil pans were about 8 gallons.
i don't have that system on my old tractor, but i routinely dump in all the waste oil in that. I have a centifuge spinner/filter just for that purpose. Been doing it for more than 30 yrs.. Zero problems.
DO NOT THINK THIS IS A GREEN LIGHT FOR YOUR TDI. (WASTE ENGINE OIL)
My 'modern' stuff, the small cummins, that have either the P pump, or the Vp44, all get 2 stroke, I am thinking about moving over to Opti lube, only for the economics. my 2 stroke regime, is 1 oz per gallon.. basically a quart at every fill. so it's 10 cents per gallon to treat @ wally world prices. Opti lube seems to be closer to about .07, but i'm afraid shipping will negate any savings.
My local pump guy has shown me pumps that were forced to eat todays fuel.. and shown me pumps that were fed 2 stroke for the past 10 years. No contest. The only reason the 2 stroked pump was in the shop, was because the body rotted off the frame, and the new owner wanted it 'checked out'.
Will the typical owner ever be rewarded for routinely adding extra lube?? Probably not. It'll be traded and long forgotten. But the next owner will sure love ya!