I had a hairline crack in water pump housing causing coolant to leak so the valve covers and timing cover had to be removed and special sealer was used to stop the leak. No more leaks and beats the new block. It was a factory defect. Other than that car's been solid.
Thanks for sharing this. I was thinking of running this oil in my G37 also, currently running M1 5w30. Whats the reason for going to a thicker oil? It doesn't look like it help much with the wear. Have you noticed a hit with gas the mileage or sluggishness ?
This is a minor point, but it is possible that was Mobil 1 5W30 EP three changes ago instead of ESP?
I've never seen an analysis of that ESP with so much magnesium before.