SDL radiator is larger as the oil cooler is mounted in a different spot. The SDL vs SD weight difference is only a few hundred pounds, so any theory of the radiator cooling being insufficient is just silly at best.
My SD and SDL deal with excess heat fine, nearly as hot as LV and I do not have problems. Why? I have newer radiators (less than 10 years), correct coolant, clean condensers, working fan clutches.
The PO said the problem 'radiator came from the SD'... it is probably 20 years old or OLDER. Just buy a new radiator and get on with life.
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I'm not a doctor, but I'll have a look. 
'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k
Six others from BMW, GM, and Ford.
Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]
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