This is the first sample I sent out for my truck. As you can see it was about 10 months ago and the truck is coming up for another oil change. I wanted to see what you guys think. I have had this truck since the Fall of 2009, I bought it with 161K miles. Last winter it developed a romping issue on cold starts and I am considering changing to a different type/brand of oil to help the romping issue as winter is just around the corner. I have always used Rotella T 15W40. This truck is used for towing probably 50% of the time, usually pulling a 5 to 6K lb trailer, so nothing really heavy. Thanks for any suggestions.