Over 30 years ago, when I was a know-nothing kid just out of high school my first full time job was at one of those no-name, el-cheapo gas stations. Everything they sold was the cheapest they could lay their hands on. Not only did they sell a non-detergent oil in straight 20 and 30 weight, we actually sold used bulk oil. We pumped it out of a tank into a quart glass bottle and sold it for 15 cents. Hard for me to imagine now that anyone could be so dumb as to put that stuff into any engine, even an old junker...let alone a newer car. It was absolutely black.