I installed my oil catch can at my last oil change at 36,447 miles. I have been saving the oil from the can into a water bottle and changed the oil again this weekend at 42,252 miles. This is what was collected in the can in 5,805 miles! Not sure how many ounces this is, but it's 2" up on a standard water bottle. This oil change also happened to land on 1000 engine hours!
