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Oil Coolers - To Drain, Or Not To Drain:
I have no drain plug on the oil cooler on my W116. I used to unbolt the lower hose and drain it, but quit because it was such a PITA.
What's the forum's consensus on draining it??? Seems to me that if you do drain it, you would have to block the airflow through the radiator to get the motor hot enough for it to open and fill.
My car never gets over 185°/190°F...ever, so I am curious to see what others are doing....Robert
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 Did you just pass my 740 at 200 kmh in a 300SD?????
1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013
100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership 
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