not to touch = these mixtures...we had to stick to what they used to call then, HEAVY DUTY = OILS ( 10,20,30W ) . No soap, no detergents, no chemicals add etc etc. HD was = pure ??? Popular Mechanic had an article on these oils that I still memorialize each time we make and eat spaghetti...30, 50, = oils are like a really heavy meat sauce... when you put your = spoon in it ( like the tomato juice with the celery ), it does not move ! heat it, = it becomes heavier...should be opposite ! ( I know a lot of persons that = will not like what I just mentionned) but if you add some noodles, more noodles and mix them and heat them.. the = mixture gets easier and easier to mix and more liquified = etc...like 5 in W50, 10 in W30... even my wife did understand this ! I had to say this. = because she is wonderful, yes yes yes. Problem is: when you make spag meat = sauce, how to you add and divide to make it 30 ???