Originally Posted by OilUzer
are heavy duty oils incompatible with moly (ie cannot absorb it or mix well) or not much moly is needed since the oil is already "heavy duty" (whatever it means) or are diesel engines that much different that high amount of moly is not required or is moly over-rated in general!? I never owned a diesel engine.
Historically, at least two specifications found on some HDEOs either explicitly had an issue with moly or wanted to limit friction modification. I'm thinking of an earlier iteration of the Cummins spec and the motorcycle spec. The latter wasn't too common, but the former certainly was. Personally, I don't worry too much about specific ingredients for a fully formulated motor oil. If it really meets the specifications they claim, that's sufficient. The formulators know how to tailor friction modification and AW, and they aren't married to one specific ingredient. As already pointed out, maybe one of our formulators can give us a bit more information.
The phosphorus on Shell ROTELLA Multi-Vehicle 5w-30 is limited to 800 ppm because it's an E6 lubricant, and, I suppose, also because it's SN in a 5w-30 and the waiver is gone for HDEOs in 0w-30, 5w-30, and 10w-30. ACEA E6, however, predated that rule, so even CJ-4 E6 lubricants had reduced phosphorus.
With respect to availability, this is neither here nor there for me. I don't tend to buy oil from Walmart anyhow, or even Canadian Tire (especially HDEOs at Canadian Tire since their HDEO prices are ridiculous, even on sale), so what they sell or don't sell is irrelevant. People can talk about Walmart all they like, but if the local Walmart doesn't have half the M1 0w-40 (let alone GC 0w-30) to do a complete oil change on any German car with a sump size greater than 4 L (i.e. virtually all of them), dismissing this E6 lube as unavailable is a bit silly, by my point of view.
The distributor can get it for me, and that's good enough. It worked with me for Delvac 1 and Delvac 1300; I never bought either from Canadian Tire or Walmart.
