I have learned to hold Pennzoil Ultra in pretty high regard. I'm just trying to see if there is an alternative to the Castrol TWS that I've been running in the M3.
The more I read about the TWS, the more I'm leaning on staying with it. But everything is here-say for now until I try each oil or at least read about it.
The Pennzoil does not seem cheaper than TWS, and I have not read about any advantage that is has over TWS. This goes for the Redline, Motul or any other 10W-60 as well.
TWS has had more than a decade of use in M powered BMWs including mine...I will stick with it in my S54 M Coupe.