Purchased 2 used about 28 hrs 2005 RXP. Previous owner said change the oil with syn 10w40 so I did. Went out for a ride after leak checking the engine compartment while running using the hose adaptor. Put in and rode with the learning key about 10 minutes then the "check eng" light came on, turn ski off and waited then started and rode back to ramp to load. when loading on trailer notice an excessive amout of white smoke from the exhaust. What does this mean.