Suppose Driven DT40 5w40 could be another option?
Isn’t even suggested for MB certification, but I can’t imagine that 30 year old requirement is terribly finicky or sophisticated.
I will be picking up a M119 SL500 soon. This is from the 96-98 era with the M119 V8, but the newer transmission. It has under 60k miles and has had a lot a decent amount of oil and fluid changes in its history, but wasn’t driven a ton in the last few years.
I’d like to source as much from FCP...
Still gets their cost of ownership low for marketing purposes.
Until you need a timing chain job at 90k.
I change oil every 4k on my full size RR. I also went up in grade to 0w30.