On my 2011 Infiniti QX56 Les Schwab put regular oil in my synthetic engine what does it do to my car

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Les Schwab for two oil changes put regular oil in my synthetic engine on the third oil change they never did an oil change in for 2000 miles I didn’t find this out so I changed my oil with the proper oil recommended for my car now it’s acting funny

How long has your 2011 INFINITI QX56 had this problem?

Les Schwab put regular oil in my synthetic engine