REPEAT AFTER ME... UOA's are a terrible indicator of how well an engine is wearing, but are great indicators of the health of your oil and the level at which it can do its job. I really wish that was a sticky on this board.
That said, there are a bunch of Mobil guys on this board that have long histories of only using Mobil-1 in their engines and have achieved some pretty impressive mileages with spotless engine internals to boot.
The whole M1 causes excess wear started because someone "thinks" they know that M1 has cheapened out their basestocks by using more GRP-III versus PAO as in the past but this is just a rumor that M1 won't confirm.
Also most people that see high Iron numbers in their UOA's are seeing them because they are hopscotching from one oil to the next and then to M1. M1 is only guilty of being an excellent cleaner and could be cleaning up Iron residue left by other oils. Besides we are talking about a few parts per million. Doug says the condemnation point is something like 150ppm and not the low double digits some see. Most see single digits in their UOA. None of this matters thought because UOA's aren't a scientific way to prove wear is occuring. Even with trending it is a million to one that you can predict such wear.
There are members of this board that have had engine failure or engine damage and their UOA's showed them nothing out of the ordinary right before the disaster.
The man to speak to is Doug Hillary. He is the man when it comes to Mobil-1
I too have used M1 for the first 80K KM and have had nothing but excellent results. I switched because M1 is much more expensive up here compared to the US and I can get Amsoil for almost the same price. Amsoil offers me some things that the M1 oil doesn't and so I have stuck with them.
If I had access to cheap M1 oil here in this country on my store shelves as you do, I would use nothing else.
That said I like their Turbo Diesel Truck 5w40, their 0w40, and anything in their Extended Performance line. 5w30 etc. as these have super duper additive packages and base-stocks. Their regular line which doesn't fall into this category is good too, but just for not as many miles IMO.