Not to revive this thread. But for what it’s worth, we’ve had Rover since 96’. Currently still have a 2010 RR 5.0 N.A. and 19 RE 5.0 SC. We’ve been running 40 weight since new.
Not real issue, the UOA comes back really well for the most part. I don’t know if there is any benefits but we have several MB vehicles that run 40 and I personally like it more (piece of mind). Chains were done at 65k miles. There was a spike is Fe (Iron) at one point, no idea from where and it’s slowly dropping