I am wondering how does one get all the engine oil out when draining it? There must be plenty of old oil remaining in the oil cooler and it's associated hoses. I wonder how much oil remains in there and how can you get it out on the 2014 Street Glide? It doesn't make sense replacing oil only to have plenty of the old oil remaining in the engine and oil cooler system. I don't care for the Scavenger tool. Not my thing. What method do you use to get the old oil out of the oil cooler system before pouring in the fresh oil?