I bought my first diesel, 2003 F-250 crew cab 4x4 with the 6.0 and it has a K&N system. Its a one owner truck with 101,000 miles on it. The man said he did very little towing with it, just a small boat every now and then. He changed the oil every 7000 miles and has all the documents of all other fluid changes and maintainence since new. Anyway i was wondering if its better to buy the EGR delete kit now or just keep with the gerneral maintainence and hope for the best. I dont do much towing, just a car trailer a couple times a year. Also, should I be using a additive like diesel keen and how often should I use it? Thanks for the help.