I was planning to go back to Valvoline VR1. I have a limited choice in my part of town. The local parts stores only carry the popular conventional oils for the most part.

Durham Missouri

Order it online.  Amazon usually have great prices.  Jegs and Summit are also good sources and sometimes have it priced better than local stores.  They all offer free shipping for a certain dollar amount.  And I'm sure it can be found other places.
Sometimes you can by it by the quart for less than a case.  Order 6 individual quarts and they'll send a case and it will cost less than a case.  Watch out for that and you can save a couple bucks more.


Lawrenceville, GA

When looking at oil technical data the VISCOSITY INDEX tells you how stable the weight is. The higher the VI number the less it will change in weight from cold starting to  when the engine is at its maximum temperature. A 0w40 will have similar weight to a 15w40 at 100 degrees Celsius but will be thinner at lower temps. The 0w40 will also not thin out as much at temperatures greater than 100C/212F because it will have a greater VI than the 15w40. The further those numbers are apart the more stable the viscosity.  

Way too much info for me. I'm 71 and been a car guy since I was 16. Driven a lot of hard miles and abused a lot of engines. Never had an engine failure that I could directly blame on oil failure. Always went on the theory that regular oil and filter changes were much more important on the specific oil you used. Been using Wal-Mart generic conventional oil of the weight recommended by the manufacturer in my daily drivers for 30+ years with no problems. Will be using Valvoline Racing oil in my T-Bird when I break it in and thereafter.  Used Wal-Mart generic 30W in my small engines for the same period. Recently switched to their 10W30 full synthetic for small engines. I'm not saying this guy doesn't know what he's doing but most of the oils he tested I've never heard of and are not available in my world.