A lot of things can go wrong with a "simple" oil change. Like, forgetting to put oil in. Wrong quantity of oil. Filter gets forgotten, sensors and wires get knocked around etc etc.
Not saying your problem is oil related, but **** happens. Also, dealerships aren't always the best just because the sign outside says they made the car.
If they used 0W20, or any other grade you aren't happy with, I think you are certainly entitled to ask them to put in what the owners manual requires, free of charge.
I would certainly start with the obvious, if you have the ability to do so. Check oil temp sensor wiring and connector. Also the water temp sensor.
Have you personally looked in the engine bay since OC to see anything obvious from top?
Last edited by ZoomZ; 12-01-2020 at 08:22 PM.
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