Originally Posted By: Garak
I thought the Delvac 1 ESP 5w-40 did, too, but we've had mixed signals on that. I wouldn't be able to answer for their 10w-30 or 15w-40 options, either. I suppose the only real answer would be to see a bottle, or I could dig through the API website, assuming everything is current there. Generally, though, I wouldn't consider it a huge concern, since how many vehicles call for 5w-40, 10w-30, 5w-40, or 15w-40 with API SN?
With respect to Rotella in 10w-30, if they went SN, would have to lower the phosphorus content, and they had some reason for not wanting to do that. Phosphorus isn't always the be all and end all to AW, but Ford seems to think so, so there's that reason to drop SN. It also helps, at least a bit, push the PCMO offerings in comparison.
I completely forgot about the Delvac 5w40. In my defense, I always thought the stuff was a bit of a joke seeing how it's an XOM product and priced considerably than M1 TDT 5w40. (I feel the same way about PP and Pen. Ultra as well as vanilla M1 and M1 EP btw.)
I just ask these questions because I am a bit of an HDEO fan in passenger cars. I prefer to run xxw40's in the Jeep mainly. My truck I could care less about oil wise, but discounted synthetics and gas rated HDEO's are nice.