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I owned an 83 GMC Jimmy with a 6.2 NA diesel and ran it to nearly 200k miles. I owned a 6.5 Yukon TD to 260k miles. Both engines saw various brands of true diesel oils in straight 30, then 10w-30, 15w-40 and 5w-40 oils. Some were non synthetic, others like 5W-40 were synthetic. I used Mobil...

We have a 1951 8N which I rebuilt in 1981 and still runs fine year around in South Dakota where winters drop to -20 or -30 F. Any good quality multigrade synthetic such as 5W-30 or 5W-40 will do the job and I wouldn't hesitate using 0W-30 or 0W-40 like a Mobil 1 synthetic. Many older engines...