Good Evening Everyone, So I recently acquired a 2012 F-150 with a 3.5L EcoBoost and while reading the owners manual I noted that the oil spec in the the manual is 5w30 WSS-M2C946-A (which I have since learned has been superseded by B1). I started looking at what oils would meet that spec and I really want to use Valvoline Red Bottle Maxlife. I've used that oil in the past and have always had a good experience with it. I jumped on Valvoline's website and checked the PI Sheet for Maxlife and it says that it meets Ford WSS-M2C961-A1 (in addition to being API SP, etc). In fact according to Valvoline, all of their offerings meet that spec. My google-fu has failed me so I turn to the collective wisdom of the hive mind here at BITOG. Is WSS-M2C961-A1 just the latest spec and fully backwards compatible with WSS-M2C946-B1 (and A)? What about this spec is different? And how does it relate to Dexos? (Yes I know my truck doesn't need dexos, but the 2012 Suburban my wife drives does and I would prefer to just keep one oil in the garage). I know Valvoline Red Bottle was able to meet the 1st Generation Dexos spec but Valvoline did not choose to seek that certification when it came to Generation 2, and I can see in this new SP rated oil that remains the case. https://sharena21.springcm.com/Publ...
So the long and the short of it is, I know I could go to a full synthetic oil, meet both specs (assuming 961 is backwards compatible with 946) and meet my goal of both trucks using the same oil, but I really want to go back to the Red Bottle, I've just had that good of an experience with it.
Anyway, I anxiously await your replies! Help me Obi-Wan Kenobi, you are my only hope!