I bought this '02 Sport Trac 4wd from a family friend with 60K. He bought it new in '02. Now has 150K. PO had never driven it in snow or salt, as he had his BMW shipped from WI to FL each winter. The truck sat in the garage during winter! It is the cleanest Sport Trac you've ever seen!! Over the last few months I have noticed a very quick rattle on the first startup in the morning. No more throughout the day. What is suggested at this point? Religiously change oil every 5K. There is so much written about this problem with the 4.0's, but it is also very confusing. Part of me thinks I should just keep the oil fresh and roll the dice. Some suggest the least painful thing to try is to change the tensioners. I have been pushing the pedal to the floor and cranking before starting, and that seems to make it better/quieter. Love this truck, but don't want to get involved in replacing the engine if the timing chains break.