I have an '09 with the 5.9L. Bought it new, and currently has only 63,000 miles on it. Over the past couple years, it has become a garage queen, but I still enjoy driving it a couple times a month or whenever my friends, family, or I need a truck. Only Mobile 1 5W20 since new, which I meticulously change every 9-10 months regardless of miles. Anyhow, over the past year it has developed a very noticeable engine tick during colds starts, which last approx. 5 seconds. This doesn't always occur during cols start, but seems most prevalent when truck has been sitting for a couple weeks without being started. The symptoms tell me this is temporary oil starvation to the top end. Should I be concerned with this affecting engine life or long term performance?