I've been reading a lot of the threads about the sludge problem. I live near pensacola FL and my 03 durango has just over 30000 miles on it. I looked under the cap and didn't see any froth, I wiped the bottom of the cap and it was a yellowish color. I got worried b/c I bought the D used. I am going to take it to the dealer and have them check the oil pan and do a change. I change my oil every 3k or less but I don't know what the previous owner did. What is the best thing for me to do in order to prevent the sludge from happening?