Well I do have some direct experience with what happen to much of the usage of the Detroit 6V71 and 6V92 engines. Municipal fleets like public transportation districts, school districts, military bases, airports and such by the late 1980’s and early 1990’s were being more and more required to account for ALL of their chemical and lead usage Inputs and outputs. Buy in 100 lead acids batteries and they better have 100 lead acid batteries accounted for turned back in. One lead acid battery unaccounted for was not just theft anymore, but an evirometal pee-loot-ter.
Buy/have deliver in 500 gallons of lubrication oils. Then they were expected to be able to account for all 500 gallons as wasted drained out oil. The assumption was any uncounted for oil was either air or water polluting contributing. The same with coolant anti-freezes.
The Detroits in school buses and transit buses would “lose” a gallon a day of lube oil. Cylinder/rings consumption. Blower and turbo bearings bleed. And especially external leakage from all of the forced pressurized plate covered areas in the blocks. So, no longer just let it weep (prevents rust!) with and occasional external steam cleaning, and daily lube oil topping ups.
Some local fudging initially did go on. Brought in batteries as make-ups. Brought from home used auto lube oils. Water dillution streaching out of drained coolants.
Caught-Busted. Not just individual fired. Agency big-time-fined. Loss of public funding. Management head lopping.
All true. I was there. Saw this.
Steve unruh