My family and I could a trip up to CT to see the in-laws. Half way up we pulled over for the bathroom breaks and oil check. Well I happened to touch the oil cooler and it was just that, cool. I couldn't sense any heat at all. Now at that point we had been driving an average speed of 70 mph for 1 1/2 hours.
Anyone have any ideas as to what is going on and is this something to be really concern about. Granted it is ideal to have the cooler working properly, but is there any risk of damage to the engine? BTW this is on my '83 TD.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member