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That makes real new sense to me too thanks @nissannewby mate and apologies @Bluedog69 mate for jumping in here.
On my old tractor 6.5NA Chevy diesel conversion Patrol motor I’ve been using Valvoline-Super Diesel 15w-40 and finding it blackens very quickly.
Is that hopefully a good thing too clearing out its old crud or could this hot running old dinosaur be thermally breaking the wrong oil down too quickly, does oil blacken off when super heated too?
Have kindly been advised I need to pull my finger out and finally add my better oil cooler and extra volume one day when time permits too!
EDIT: For the OP’s question too, I thought mid west WA ambient average morning temps would require a higher start up number other than ‘5’ -40 if that’s how it works thought tought before too?
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