I get it for less than $4 a quart from my buddy who works at the dealer. It is the factory fil for my GM truck so I continue to use it. I have also had outstanding results using it in my old LS1 engine, which has 80,000 miles. Prior to this oil the car ran on conventional since the day it was built. Like many LS1' the car had occasional cold start piston slap. Since switching over to ac delco syn blend that has been eliminated. I'm pretty old school so I do not do extended oil change intervals, so I can't speak to its durability beyond 3000 miles. Overall I'm a big fan of it and General Motors must be as well as they feel the new Camaros and Corvettes with it. If you read the back of the container it supersedes and replaced the old synthetic oil specs for a GM