Can buy a 5 quart container of M1 0w30 ESP for $39 at Advanced Auto. It's rated C3, light diesel use. Our tractor engines are not steam ship nor locomotive diesels.
0w oil is for Euro-weenie cars used in cold climates, IMHO. It's deemed necessary for the myriad chain tensioners on camshafts, etc. I can see it on an OHC gas engine in cold-as-hell Europe where the Hausfrau starts her car up to drive 2 miles to Market once a day.
But in this Country, for the most part a 5w-40 full syn diesel is what I would recommend.
The OEM recommends a 10w-30 because there are too many VII's in a 10w-40 that can break down. It's why 10w-40 went out of favor everywhere. 10w-30 is what they use for Factory fill because of one reason and one reason only....... It's cheap and, 1a) makes the managerial elites at EPA happy (fuel economy, doncha know).
Ram used to factory fill their Cummins engines with 5w-40 full syn Valvoline. Then they went to T6. Then, when the accountants discovered how much they could save, they went to 10w-30 dino. It's probably good, not great, but good oil. Accountants and lawyers are the bane of a company's existence.
Owners manuals aren't going to recommend anything different than what they use at the factory. So if you want to use the product that the OEM gets from the Lowest Bidder...... Go for it.
I try to use 5w-40 full syn if I can. If I can't, I'll use a 15w-40. But I'll do my best to hold out for a 5w-40 full syn.
OTOH, I could be completely wrong
