quote:I too have used used both extensivly. The Rotella syn is really good for cold starts, but it seems to have some solubility problems. Group III and group IV oil do have solubility issues that most of the oil companies have overcome, but I think Shell has a bit further to go. I experienced this problem with the CH rated Rotella syn, but haven't tried the CI rated Rotella syn yet. From experience, I do believe that Delvac and Delo are the finest HDEO's on the planet.
Originally posted by Audi Junkie: I've used both extensively and really like the Delvac. In your HM application, synthetic may not be the ticket. Rotella syn is a great oil at lower temps and in a newer, high-revving or turbo engine.
quote:Steve , I like you and think your a nice guy but can you provide ABSOLUTE proof the Chevron oil you speak of is ENTIRELY comprised of group II ? Until then, it's group I/III with the marjority being group II in my books and that does not inclide group II+ .... Diesels don't need it...yet The caps are not shouting , an effort as an exclamation of sorts .
Originally posted by Steve S: Chevron Delo 400 can't be beat . Check the oil anaylsis' Imo Mobil 1300 places lower on uoa numbers than the common hdeo's. The Group 1 oils are self polluting crap that is not worth putting in an engine . I was a diehard syn. oil user untill I saw the results of the "hydroisomerized base oils", seems that unless real cold is involved the hdeo's hydro oils can't be beat . Although, Delvac 1 or Amsoil diesel ,marine oil would be a good choice in a synthetic with a cushion for the cold.
quote:None of those oils are comprised entirely of group II . The high levels of Ca and Mg in HDD oils are a reflection of both the high level of detergency and the TBN. The high TBN is established by "over basing" the organic acid detergents. This is accomplished by adding excess Ca and/or Mg hydroxide to the detergent package. This allows the additive package in HDD oils to neutralize acids for a longer time than PCMOs. The limit for addition of over-based detergent is solvency. Add too much and the additives will drop out of solution. Thus the need of good ole group I as the additve pack carrier . We need not worry Bill , neither of us have Diesel engines ........ unless you have a new car/truck you have not told me about
Originally posted by GROUCHO MARX: Motorbike, stop teasing and tell me.