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Originally Posted by 300DPETE
I would like to use synthetic oil (trying to go non-dino as much as possible with VO and biodiesel), but I was told that Delo 400 15w40 was the best oil to use for my 1982 300D.
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I'm pretty sure that more dino is consumed in the making of Mobil One than is present in a jug of Delo 400. Delo 400 and Delvac 1300 are probably the best non-synthetic oils for your 300D, but the best oil would be Delvac One synthetic 5w-40, now also marketed as Mobil One truck & SUV formula 5w-40. Amsoil diesel oil uses the same base stock with Amsoil's additive package, and might possibly be a little better stuff, but the Mobil is more readily available.
Since Castrol started calling group III dino oil "synthetic" and getting away with it, the vast majority of the "synthetic" oils are closer to Delo400 than they are to MobilOne. About ten years ago, after the price of Castrol Syntec dropped below MobilOne, and before I knew why, I used it for one oil change in a gasser. It did not hold up like MobilOne, viscocity dropped within 2000 miles, and oil consumption went up. Switching back to M1 cured it. I think it's crazy to spend three times the price of Delo for Rotella "synthetic".