All oils SAE rated have an implied HTHS number weather listed or not without looking it up thin the 15w-40 is about 4.6 or 4.7. There is always a give and take between properties such as fuel efficiency vs wear. The HTHS number was originally used to help predict crank bearing wear.
I believe its more important to change oil at closer intervals . I believe the oils we are talking about have differences but the soot etc is probably more important . On that note I am surprised more CRD owners don't use bypass oil filter systems with much better filtering which may well be of even more benefit.
I only know of Mass-Hole and couple of others that do. I have installed this on one CRD and plan to get them on my sons CRDs soon also.
_________________ 05 Blu LIM, OME GDE Tbo, wk II 245/75/17, KC Lights, bull bar, 195K H TC 05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC 06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC 06 D Khaki Lim 126K wkII Eur TC 05 D khaki Lim 145k refurbishing All CRDS: Fumoto, Lift , Fan Shroud mod, fuel head Gen II, SAMCOS,self TB, 2 Mic filt, Hayden
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