Spencer:
"Do not use waste oils of any sort unless it's veg oil."
this is a bold statement on your part,
waste oils of any sort? oh really?
"All lubricating oils have additives and when burnt these additives chemically change and produce a abrasive ash..."
yes it is true that lube oils contain additives, however where is it written that
these additives chemically change to an abrasive ash?
"which can wear piston rings and cylinder bores out in as little time as 1500 hours of use."
this might also be true of some oils and some engine's, however it isalso likely true that there are combinations of oil and engine types that might well do significantly better than 1500hours, even you reported 2000 hours or 33.3% longer life than your assertion
"The additives can not be removed by filtering or distilling or gassing of the oil."
Bullcrap! unless you can produce some documentation of this as fact, i think you are overstating to say the least, filtering by common means might be ineffective, but distillation/cracking can certainly separate the oil from lighter fractions, gasses, and leave the additive packages behind, and by gassing you mean gasification of the oil in a gasifier, clearly you don't understand that process.
however i might be full of crap as well, perhaps you can produce some text supporting your assertions?
"This subject is really one for chemists as is a very complex one and any one with connections with the petrol chemical industry may be able to give a better description of what's going on."
while i agree in concept, i would suggest that this is not the exclusive purview of the chemist, i would suspect anyone that devotes enough time to study might well be able to answer these and other questions of the technical aspects.
i really believe you are over the line on this one, for all sorts of reasons, most of which that have been clearly laid out here and on the MCG forum.
bottom line is this, even if you are 100% correct, in your assertions, how can you presume to state with any authority what might well be acceptable for some folks under a variety of applications as being bad.
diesel fuel is 3.50 plus a gallon here now, while waste motor oil is something i am swimming in, and from a source that is consistent and as clean as drained from the engine's they came out of, all the same weight, all the same low ash cat/safe tier 4 compliant oil.
how in the hell can you tell me that running 2000 hour on this oil is bad? when my
engine consumes about 3/4 gallon per hour of run time at full load, it would consume about 1500 gallons in 2000 hours, at a cost of 3.50/gallon = 5250 dollars
for 5250 bucks i can afford a new engine and still have money in my pocket
(actually for what i paid for the s195 i could buy 10 new engines and have enough change left over to buy a night out at a 5 star steak house for the wife and i)
bob g