Yeah, it's hard to go wrong with Glen around...
Honestly I'd recommend 20W-50 or 10W-40 Brad Penn oil, which is what I use in my M117s. It is excellent quality and has all of the ZDDP that you would need for an older car's motors. Porsche and Muscle Car guys LIVE by this oil. And it's Jono-approved, too
I used to use Chevron Supreme 20W-50 for many years in my oldtimers, but they changed the formula some years back and took out a lot of the ZDDP, which I think was what led to the demise of my SEC's right-side camshaft.
If you go with a synthetic, it will provide good detergent qualities too. Just be sure it's a quality oil like RedLine or Motul. However for engines as old as yours, I don't recommend synthetics. Just get a quality dino or semi-synth dino (like Brad Penn) and use that with OCIs of 3K.
Diesel oils also have extra detergents in them (you saw the inside the top end photos of my wife's M104, which has used diesel-rated DELO 400 for the past 5 years or so) so they keep things nice and cleaned out.
Cheers,
Gerry
For the W111...
Motor: Mobil Delvac Super 1300 15W-40
Tranny Additive: Bar’s Leaks Automatic Transmission Repair
Thx for the input guys, its very helpful !


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