so i have been working with an old truck leaf spring making (or trying to make) knives and other bladed objects. i have some some dabbling with quenching in different mediums. water,motor oil (new and used). i heat them up to a tangerine orange color (a bit past non magnetic) then vertically quench in one of the aforementioned. they do get hard but i was just curious what others peoples experiences have been? what works best?