A man holding Royal Purple HMX 5W‑30 motor oil from a purple bottle.© Car Car/YouTube A lineup of Royal Purple motor oil in purple bottles with yellow caps.© Car Car/YouTube ...

It emitted from the bottle in a fine mist that spanned wide enough to cover my body without having to go overboard. And unlike other spray-on oils I’ve used, this one didn’t send me slipping ...

Royal Purple's brochure brags about an oil film "3 to 4 times as strong as any comparable lubricant," which means fewer metal‑to‑metal introductions under big load. The same handout states ...