I have a 2014 Q60S (which I'm sure you know is just a rebadged G37), a 2004 350Z and a 1990 5.0L Mustang.
I run Mobil 1 in all three and also ran it in a 2001 Honda Accord which I gave to my son. That Honda has 170K on it and still runs like new. The Z has had Mobil 1 oil changes and now has 125K on it and runs like new.
The Q60S only has 9K miles on it and I am hoping that by using a full synthetic it too will last a long time.
A full synthetic reduces wear as compared to regular oil. It also resists sludge and varnish issues far better then
conventional oils. But, both types will still suspend byproducts of combustion and need to be changed on a regular
basis. This BS of leaving oil in a VQ engine for 10K or 15K just because it is synthetic will net you a badly
sludged up engine and a ton of that brown varnish crap all over everything which will reduce engine life.
I have had many engines apart and I can tell you that full synthetic oils are better. Also, it is never too late to start using them and they will NOT damage seals or anything else. Those are old BS tales that were born on the internet by people who do not know jack about engines. Nothing beats a good quality synthetic oil. They maintain viscosity under adverse conditions far better then conventional motor oils. I even use Mobil 1 in my Hustler Mini Z mower's Kawasaki engine. Also use it in the Briggs engine in my generator. The stuff just plain works. As my dad used to say, good oil is cheap insurance.. Real cheap insurance considering what engine repairs cost these days.