...because it would. CHAIN Oil is a type of petrolueum distallate. Its visocity is by design. Its the proper oil for the job......and any "invented" substitutes are of an odd, albiet creative mind.I would think that ATF would be way too thin with a tendency to fly off the end of the bar and fail to lubricate wherre it is needed the most.
Used engine oil gets re-cycled ONLY.
Transmission "FLUID" is intended to be used as a Hydraulic fluid........not a hi-tack lubricant.
Can we please close this thread.