I've bought 18 quarts of Mobil Super Synthetic 0w20 at O'Reilly's Auto Parts in the past week. Shaking the quart bottle, it sounds like water......nice and light and thin.
For some of my Friends, Family and Neighbors who like to use the name "Mobil", I will be mixing this 50/50 with Mobil Delvac Super 1300, 15w40 this Fall for their winter OCI's.
In NYC it is not cost effective to run a full synthetic for a long period of time since it is VERY severe driving with short trips, lots of idling in stop and go traffic, lots of traffic lights and slow speeds. This all adds up to fuel dilution, dirty air filters and plenty of wear and tear so the oil has to be changed by at least 6K miles. Even 6K miles is stretching out the OCI to the MAX.
The mix of Diesel Dino and synthetic is the way to go in this environment.