DD-i think people usually say that, when talking about this chart cause they fail to realize that, in the chart the WMO was tested at a 200:1 ratio and even at that it was a +2 improvement. now if you want to talk about metal particles then thats a valid worry of mine, the higher s.g is also a worry but both of these challenges can be overcome with a centrifuge and correct blending(unless you got a P7100 pump then who cares cause those things a dang near pump roofing tar)
then you need to worry about the incomplete burn, i.e. Blue smoke and coking but water injection and maybe a slightly advanced timing can help with this.
another tip that not many people dont think about is the fact that engine oil has detergents that are designed to keep water suspended. this makes it so that when you have water in the crankcase oil, it doesnt settle to the bottom of the oil pan. if that was to happen then when you started the engine it would suck the water into the oil pickup tube directly into the engine.
with the water suspended it just goes through the system until the oil reaches operating temp and then the water boils out.
and every time you shut down a engine that has a vented crank case water from the humid air collects inside. thus making these detergents necessary even for engines that are not off-roading.
water in wmo doesnt completly settle out like it does in WVO (some will but not all). some people think that if it stays suspended then it doesnt matter but i dont like that theory. therfore i settle my oil before boiling.
moral of the story is you need to
1.get the oil as clean as possible
2.get the water out (i only use the settling technique prior to boiling)
3.get the s.g. as close to D#2 as possible
4.keep the combustion chamber clean (water injection)
if you do these steps you can burn wmo in anything that doesnt have an optic sensor
the farther away from .76sg you get the more you are relying on the hardiness of your lift pump and injection pump.
BTW the s.g of #2 diesel is .76sg relative
also waste oil heaters are not compressed combustion chambers.
it might sound like im picking on you mopar man but i hope you realize im just giving another look at wmo.i hope you have no hard feelings