No blend that I have read. What do you mean by blend? Like it has actual Grp. IV or V? No way my friend, I would put my last dollar on that one. It is just a quality Grp.II most likely with some chemical seal conditioners. No one on this site knows exactly what it is, and if they did they can't say
So is it a blend of Mobil Super and Mobil Super Synthetic?
Also, from their web-site Mobil Super HM looks pretty similar to Mobil Super, so what's the difference? (aside from "Help control oil consumption and loss"?)
I'm baffled, the M1 Super 5K specs look better, not by a whole lot but better FP, VI. If it is a blend then they both are I guess, or I am just lost somewhere. Either way They both look like good oils. Maybe slight Grp III added.
Mobil Super High Mileage
High Mileage Motor Oil
Product Description
Mobil Super High Mileage uses a combination of synthetic and conventional high quality base oils combined with modern performance additives to help provide long engine life and outstanding protection for vehicles with more than 75,000 miles. Formulated with seal conditioner, Mobil Super High Milegage helps prevent leaks and reduce oil consumption.