I have, but it comes with the territory of turning wrenches for a living. And you hit the nail on the head, it's all about peace of mind for some. I personally like the fact that a heavier synthetic will hit the already too dry top end of an r series engine well before a thinner dyno would, plus I like to rev pretty high for these engines, typically for too long and with not enough load
![Ack :ack:](https://board.marlincrawler.com/Smileys/marlin/ack.gif)