If the white smoke is coming from the Cat area, check the condition of the otterstat seal on the left hand coolant pipe in the boot. In addition, there is a coolant drain plug and copper seal on the left hand side of the engine. This could have come loose, as mine did. You can tighten the plug with the same 3/8 drive utilized during oil plug removal for oil & filter changes. Additionally, remember to pressure test your coolant system, and bleed ALL air from the coolant system after servicing. Best Wishes, Michael Pack