Baddad, it's a myth that synthetic oils prevent proper break-in You can switch over (and back) at any time.
Modern oils do NOT use graphite. I think you are thinking of molybdenum ... or "moly" for short. The form used in oils is a soluble moly, and not the disulphide used in anti-seize, etc ... And even then, Honda uses a LOT of molybdenum in their oils (especially the factory break-in oil) but Ford uses
none in their Motorcraft oils. They used a boron-based anti-wear additive instead. Some oils like Pennzoil, Chevron and Mobil 1 use both moly and boron in balanced amounts.
Arco had a grahite oil on the market decades ago but it is not sure whether it was any better than any other 'normal' oil ... and probably because it was dark grey right out of the bottle, it never caught on and was taken off the market long ago.
Check your manual, but the book for my QR25DE says to use mineral oils, not synthetics. I think this is BS. Nissan might be worried that people will use somehting like Amsoil and then go 25,000 miles without an oil change ... which would be very bad. But there's no reason most "synthetics" (whatever that means these days) can't be used as long as you never exceed factory drain intervals.
I use Schaeffer Oil, a private blender in St. Louis Missouri. Specifically, I run their Supreme 7000 synthetic blend which is a real 20-25% PAO and Group II+ mineral blend unlike most of the mass-market oils which are no longer true synthetics (Mobil 1 being an major exception). Schaeffer also has double the moly of most off-the-shelf oils, and has had this for years:
http://www.schaefferoil.com/
Choose either 5W-30 or 10W-30 depending how cold it gets in your area. The stuff is very robust and only the most extreme applications will cause them to shear down. All this for about $3 per quart.
I know someone who has your engine in a new Quest and has used this oil with great results. I'll try to find his lab report and post a link to it in the coming days.
In the meantime, try searching this forum using the word "synthetic" as well as the various oil brand names such as "Pennzoil," "Chevron" or "Castrol" for more motor oil discussion. There's plenty here.
