Thanks for all the suggestions. I had already done most of them, except the 20/50 synthetic oil. I have run Rotella T 20/50 for most of the life of this car. Seems to have worked, but I have considered running synthetic if I can't fix this running hot problem. It seems that changing the oil cooler and replacing the oil thermostat did have a minor positive impact. Still runs hot on load. What turbo component would make an engine run hot? I almost feel that the original thermostat had a different flow capacity than the current ones (I have put three new ones in ). THe car began running hot after I replace the original thermostat and over heated the car on the first run. Did not bleed the the air out of the cooling system correctly and it overheated less than two blocks from the house. Any advice before I take it in to the dealer?

Henry

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63 190d (sold)
69 220D (sold)
69 280SL (sold)
76 BMW 2002 (sold)
86 190E-16v (Demised at Laguna Seca Turn 9)
87 300SDL (sold)
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95 E320W 311k
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05 C320 4matic
06 E320 CDI 90k (Totaled by a texting 19 year old girl in a nissan)
2013 GLK 250 Bluetek 4MATIC 295k