Mobil 1 15-50 is not high zinc anymore.Probably the closet is M1 15w-50 and much more available to me than a 5w50. Frankenbrews won't be happening. Most don't give the numbers people think they give just mixing bottles. Again, without guessing, I'm looking for actual experience with synthetic 50 or 60 wt oils that will still not punish a catalytic converter to death.
As of six weeks ago, it was still specifically listed with over 1300 ppm and for flat tappet camshafts so unless it changed in May after I started this thread, I doubt it.Mobil 1 15-50 is not high zinc anymore.
When it became SN rated here in the US.