Q: I have been using 20W40 engine oil out of ignorant for two years now on my Passat cc 2009 model But I found out that the right oil

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I have been using 20W40 engine oil out of ignorant for two years now on my Passat cc 2009 model But I found out that the right oil is 5W30 or 5W40 so I want to find out if I change to the right oil what will be the consequences?

My car has 10600 miles.
My car has an automatic transmission.

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