chevyCowboy
I might be crazy but i ain't dumb
Do any of you guys run lighter oil in the cold months of the year? never have but need to change oil and was wondering about it
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Same hereI've always run 0-40 in all my diesels. The 0 grade really does well in the cold.
As I recall the original spec for the 6.2 engine was a straight 30 weight. Not sure if it had a winter grade in the manual. Oil has improved since 1982 and the the EPA got involved in the latest oils (2007 for diesels).
I run a semi-synthetic 15w-50... Better oil pressure when it's hot. I get nervous with a "light" base oil dependent on not shearing down when hot. (Not that I see it much in 3000 mile oil changes, but 20K in a NV5600 has sheared AMSOIL down to a 20 weight from a 5w-30 weight. Oil was lifetime reduced to 50K mile changes in later years.) Unless the polymers, that can shear down, do their job you are stuck at the base weight oil.
Reaching for synthetic is sometimes marketing term, but, makes leaks worse and IMO will start the oil cooler lines leaking. Make sure you know what you are buying with synthetic. Then be prepared to fix some leaks.
In general with synthetic I see higher oil pressure when hot and easier starting same grade. Diesel synthetic oil tends to be 5w-40 unless you custom order it. (Water thin Royal Purple doesn't count as oil.)
http://www.thetruckstop.us/forum/th...bility-in-a-6-2-internal-oil-flow-info.41477/
And from the above paper we can say that changing your oil to reduce soot helps oil pressure come up faster. Or in my case gapless rings keeping soot in oil down.
High soot content or burning the oil with high temperatures will thicken the oil.