So, as I understand it: Non detergent oil is used in air compressors because the moisture will settle to the bottom of the drain vs. emulsifying. Seems to make sense to me. Now, here's the confusion. My compressor, a Kobalt 30 gallon compressor, has a sticker on the side that says non-detergent oil. In the product manual, it specs out either Kobalt's own oil, or Mobil 1 synthetic 10w-30. So... This begs the question: Why would they recommend a passenger car oil while warning of "regular automotive oils" in the user manual? It still doesn't add up with the non-detergent oil labeling on the side. What's different about Mobil 1 in this application?