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Briggs and stratton 16.5hp ohv,lawn chief,blowing heavy white to blue smoke?

When I engage the blades/lower the deck,it starts blowing heavy,i mean heavy white to bluish smoke,stops for the most part when I disengage or raise the deck? Changed out the oil,used 10w30,oil levels are fine.Did this somewhat last year but went away.The only difference it was stored under my carport this past winter as opposed to the shed.Any ideas?
Ken, April 2019