if you are borderline on emissions...what you could do is change the oil to a thicker (higher viscosity) variant if you need to pass emissions...something like a 20w40 or a 20w50...however if you are in a cold climate (colorado) it makes cold starts very difficult as the oil is thicker (back in the old days you'd use a thicker aka higher viscosity oil in summer & warmer months and thinner in winter - it was a trial & error to find out what oil to use for the seasons)