Hi everybody ! I have a '77 w123 240D and it has an oil cooling radiator . Only problem is that it is cold all the time . My question is : does the oil pass through the cooler all the time , pushed by the pump , or is there some sort of thermostat ? The cooler is cold even after city driving ... Can anyone tell me how the oil is circulating , and if i should be worried about the cooler being cloggeg or something ?
Thanks !!!

There is a thermostat in the oil filter housing. Once it opens, oil should circulate through the cooler. I would not worry because the 240D I used to drive always had a cold oil cooler too and according to the person it was sold to, its still running without any problems.

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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold

Thanks for your answer ! I suppose it's ok to consider that in winter (i'm from Romania and the temperatures average now 10 deg. Celsius) the oil thermostat won't open ...

southern United States that is - and drive the 300D and 240D during hot weather. It is my opinion that the thermostats have never opened since I have been driving them. I do not have a clue what temperature the oil filter thermostat opens at.

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Jim