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check engine light

Engine

Model: 964 c2, Year:1990, Mileage:79800, Type of use:Street use only
Chris, I have not had a chance to get my car to a shop since my question a week ago.Realizing it had been a year since I last changed oil, I changed my oil from Mobile 0w40 to Shell Rotella 15w40. My reason for switching to conventional is that i just dont put many miles on the car between oil changes [only 800 mi]. I took the car for a drive afterward and the check engine light was gone. I drove for about an hour and it never came on and ran perfect. It was on before i changed the oil. Could there be any connection? Thank you for your answer.

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