The National Oil & Lube News has published its 2016 Specialty Motor Oil Guide. In it, NOLN describes a specialty motor oil as anything that falls outside the term "conventional oil", i.e., synthetic, synthetic-blend, high-mileage, etc.  

 

While some marketers actually produce their "conventional" oil from a blend of synthetic and conventional base stocks, for the purposes of this guide, only those products that are specifically marketed as a "synthetic-blend" are listed. 

 

NOLN also lists which engine oil specifications a product meets, be it API, ILSAC, ACEA, dexos or other.
 
NOLN made a special note of thanks to Shell for sponsoring this year's guide.
 
Click to view the Specialty Motor Oil Guide.