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@edyvw said, their oils are good but are they THAT much better than the competition? You have to factor in many things such as price, availability and specifications of the oil itself has.
Here is the eco-lite that is dexos1Gen2 approved. This oil is good for a 5w30 grade and comparable to other brands with the same weight and specs. It has a good TBN. Even the viscosity at 100 degrees is 11.4 so it is on the thicker end of being a 5w30. If I can recall correctly PP ultra has a V100 of 10.3 and Mobil 1 EP has a v100 of 10.6 (both of which still fall in the 5w30 spectrum), but this is going off the top of my head and this is just a little fun info for you to consider.
Also, the oil has a HTHS of 3.3, M1 EP and PP Ultra have a HTHS of 3.0 from what I've seen last around here, it may have or may not have increased but these differences are minuscule but still something to consider if you want to. Note: Pennzoil doesn't give HTHS info on their sheets anymore, neither does M1 (on their sites) but M1 did have HTHS for their 0w40 oil.
The reason I am comparing it to M1 EP and Pennzoil Ultra is because both of these oils coupled with a good filter will do an equal job compared to Motul Eco lite running on the same interval. Not only that, they will be MUCH cheaper alternatives. The money you save on the price differences you can allocate to a quality oil filter and then treat yourself to a combo from Mcdonald's.
Keep digging around this site, you will find the information that you need. As for "reccomends" it's just that, a recommendation, Infiniti/Nissan have a good relationship with Motul just like Mobil 1 has with: AMG, Bentley, Aston and Porsche.