Mike,
Yes, I have. I bought a case to try last fall. No complaints so far, but a little expensive. I used to have a lifter collapse if the car sat for a week or so and would tick for about 10 min after start up. After changing to the Classic Oil, the lifter has been silent, even if it sits for a month. Was it the oil?? I don't know, but it doesn't tick anymore. I used to use a zinc additive but I don't need it with this oil.
Paul