I'm visiting my GF in coastal California for a few days and am working on some honey-do things. Yesterday I went to a locksmith to get a deadbolt cylinder re-pinned. There was a customer ahead of me, a woman who was getting a new key made for a recently-acquired early 2000s Honda CR-V. The locksmith is working in the back, then he comes out and goes to the car. He gets in and starts the car with the newly made key. Then he comes back in and starts questioning the woman about the car: Do you hear that ticking sound when you start it up? Do you know that that's not good, that it means that there are valves in the engine that are blocked and not allowing the oil to flow correctly? He then tells her to go to the auto parts store and get a quart of Lucas oil additive, then take it to the place where she gets her oil changed and have them use it in place of one of the quarts that they would refill the engine with. "I use it all the time," he says, "It makes my truck run like new." She is saying "Uh huh" and nodding and I'm just cringing. To add to his credibility he said that he used to be a mechanic and cited the list of makes that he used to work on. I would have spoken to her if I had a chance to privately, but she left and I was the next customer. He did not recommend any Lucas oil product to me, either for my lockset or for my GF's aging Celica.