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Q: reduce oil engine light came up on 2005 Mercedes-Benz C240 4MATIC

Stopped at a Shell gas station. filled 1/2 a tank of "gas", car started acting up, found out the gas station messed up. their delivery guy put diesel in their tanks instead of gas. so I got diesel in my gas tank. took it to the dealer. system was flushed. advice the dealer to check the reduce oil engine light. they recomended to change the sensor. i believe either diesel/coolant is my engine. please advice. tnx
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