I think i fixed my overheating problem.
After installing a new Behr 560 radiator, the engine temp doesn't go over 90 degree any more.
I replaced the original oil cooler with two 19 row "Racing oil coolers" from Ebay that I mounted in the front bumper.
Wonder that a new 300SD radiator would have made the same difference.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.