Hello all. Today after dropping my kid off at day care, I got back in the truck and started it up and a cloud of white smoke came out the tail pipe. The truck was warm and had been running for 20 - 30 mins prior to shut down. It was only shut off for about 5 mins. Funny thing though the truck seemed to run a lot better after that, drove it to work with no problems. When I shut it down I did a code check, nothing, zippo! What's going on?? I just started using Diesel Kleen about a month ago would that be causing any problems?