We're now in a position to discuss this. Your oil is a combination of one or more base oils and a complicated additive package. The base oils will actually last as long as your motorcycle - many hundreds of thousands of miles, several years. The reason we change our oil is the additive package wears out. The buffers get used up neutralizing acids. The detergents and dispersants get used up clinging to gunk that's too small for your oil filter to pick out. The VII package gets shredded by your transmission. You could imagine a device that pulled out your oil, gave it a very thorough cleaning, replaced the buffers, detergents, and VII molecules, and put it back into your engine. Sort of a motor oil dialysis machine. However, in a country that has Texas and Alaska, in a world where oil is $30 / barrel, this makes no sense. So, we dump out our entire four quarts of oil because 3% of the oil is used up. It's really just a cheap way of getting a bunch of contaminants out of our engine. This is why it does make sense to recycle oil: if you can process the oil hundreds of gallons at a time, you can separate out the base stocks economically. If you use synthetic oils and bring your used oil to a recycling collection point, you can feel especially good: a bunch of school buses and city buses are going to get an extra little kick in their base oil because of you. In fact, you can tell your wife that's why you need this exotic, expensive synthetic oil: it's solely out of your concern for the children. If everybody used Spiffo-Magic SuperLube the recycled oil would be junk, and in no time flat the school buses would all break down and the kids would have to walk to school, 23 miles, in the snow, uphill both ways. Why, in no time flat the kids would lose weight, improve their cardiovascular conditioning, and just generally be more healthy and have more energy. What a nightmare!
Jan. 18, 2018