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Started after  Walmart oil change and started exhaust smokeing
Vehicle: 2000 merc mystique gs 4cyl

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P0420 Catalytic system efficiency below threshold Bank 1

P1720 Vehicle speed meter circuit

P1383 Variable valve timing over retarded

You can go from a 5 20 to a 10 30 but it has to be regular not synthetic oil. In either case this is a mechanical condition , replace the camshaft solenoid, and replace the oil filter. The oil may not be the problem , the filter if not the correct application can cause P1383.

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