Nissan Ester Oil is part synthetic or full syenthic

Originally Posted by physics

Most of the Blackstone UOAs I've seen on this oil in a VQ37VHR engine look okay at the 3K to 4K mile mark, except for a consistent hot viscosity breakdown from a midline 30 weight to an upper 20 weight. I'm running NEO in my Z but will not push it past the 3K mark if I'm planning on doing any kind of spirited driving.
I do believe Nissan's claim that this particular oil reduces engine friction significantly, as I get 32 to 33 mpg in 6th gear at about 60mph on a level highway. My combined highway/city mileage is about 18mpg - I often late shift and run at higher revs than necessary. My good highway mileage was a surprise to me as I was not expecting highway mileage numbers that good in this car, a Prius it is not.