Hello, I had oil change on my car and I noticed that they put 10w40 instead of 5w30. The car had been using 5w30 all the time so I do not understand their decision to put 10w40. I looked up and 10w40 is supposed to be a thicker oil.
I have Skoda Superb 2007 with 2.0 TDI PD engine and 310 000 km on it. An old diesel engine design. I suppose that it will not do any harm since is an old engine design but I might be wrong.
What should I do? Leave it be or get the oil drained?