Same here. Can't source Pennzoil locally any more so switched to the Rotella also.
My son went with me to the auto parts store to get oil for my car. He was asking why there are so many different kinds and what's up with the purple oil? For a 15 year old it is probably the same thing as me looking for tampons for my wife. Don't ask questions just get the ones she says to get.

So I had the talk with him, about the oil anyway. I should have just stuck with "oil opinions are like @$$holes, everyone has one". It would have made things simpler.