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Your coolant thermostat is not an issue. The S65 thermostat is open without a coolant block off. The ECU reads how quickly engine gets up to operating temperature, and will throw a code if those parameters are not met. A bad thermostat would essentially take longer to warm up and throw a code. Your issue is the opposite. Your oil cooler is pitted, but If cold after reaching operating temperature, take a look at the oil thermostat. This thermostat is closed when the engine is cold so that the oil warms up quicker. Yours may not be opening enough to keep the temps down.
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