Mobil 1 15-50 synthetic??

[Duramaxdiesel]

Now that I've got MY truck I want to change all fluids. What do you guys think about using Mobil 1 15-50 synthetic year round? In the summer it hits between 25-33C and in winter frequently hits below -25C. Any help would be great. Thanks
Nick

[Professor]

Why not use Delvac 1 5W40? It is approved and certified for your DMax. Why venture into the unknown.

[jbplock]

Duramaxdiesel,
Check the spec on the Mobil 1 15w50... IIRC it's only rated CF... The Duramax needs CH-4 or CI-4. Dittos to Professor's post... If you're looking for all an all season oil, use a good synthetic Diesel oil thats rated CH-4/CI-4 such as Delvac-1. smile.gif

[Duramaxdiesel]

Thanks for the info guys. The reason I ask is because for four litres of Delvac 1 it costs $40. If I recall, the engine takes 10 litres and that equals to $120 for oil alone. I change oil every 6000 Km's or every month, which ever comes first. Oh well, I guess I'll look into buying a 45 Gal. drum and see what it works out to.
Thanks, Nick

[peachin]

Walmart - Rotella - all the correct ratings - Synthetic - $12.88 (US) 1 gallon - 5W40
Check it out - I have found it all over the US at this price. The quarts are not as good a deal
$4.96.

[Modified]

If you want the Delvac 1, check out:
http://www.avlube.com/ . $24.64/gallon, and cheaper by the case.

[Jimamatic]

While we're on the subject of oil, anyone heard
how good or bad valvaline blue synthetic is. I
heard Dodge will warranty thier diesels for
1,000,000 miles using this stuff.. that's alot of
zeros...

[george morrison]

Regarding Valvoline Blue. Valvoline and Cummins are owned by the same parent company so Cummins endorsement is a cross-sell to a sister company.. i.e. the 'endorsement' is not so much quality related as it is familial....
George