Hello Braka47.. I am sorry, but we have no such methods, tech. or length of life, time lines on these motors. If some one does.. I would be as interested as you! Chinese quality control is really bad, so a motor can last a week or two years, depending on the manufacturing equiptment's condition.. the shift it may have been produced on ( mid-nights suck, and parts off that shift may too ) , or the amount of care that the operator felt like putting in on that particular day. : )