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I know this is an old post, but I am wondering if the stock 2.5 diesel oil cooler would be sufficient to help cool the oil of the OM617. I know the 2.5 NA is not turbocharged, but the oil cooler that came with looks pretty hefty. I also like the location of the stock cooler in front of the radiator. The stock Benz oil cooler is resting under the radiator lengthwise.

Currently with the weather we are having in NY the engine temp stays at the bottom bar even after a good half hour of warming up. I know there's no load while the motor is idling, but from having other turbocharged diesels, the temps would get to normal operating temperature within ten minutes or so of idling.
Is there a thermostat fitted??
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