We come to this forum because we care about extending the life of engines and transmissions, and at the same time trying to save the earth (and money) by not throwing away good engine oil which can continue to be in service. With that out of the way, If a used oil of 3000 miles has similar wear metals, similar viscosity to the same 5000 miles oil, which I see it in a lot of UOAs, does it mean the same engine should output the same maximum power on both mileages? UOAs here showing people running their oil for more than 5000 miles. Although a lot of you have good results with it, does anyone here also did a dyno run, quarter mile run, in gear acceleration time... of different mileage on the same oil along with a UOA report? I’m trying to see if there’s any relationship between Engine Power vs Mileage/Time on the oil. So maybe we can all decide to change our oil based on quarter mile time, 0-60 time, in gear acceleration times, dyno run… without spending money to buy the kit from the oil analysis lab. But I believe new oil got to be more horsepower than 5000 mile oil, right?