my wife and y just bought a brand new 2006 dodge durango 4.7,what woul be the best filter and oil to run in this engine? is this engine one of the sludge monsters? the reason we bought this model was that it was a year end sale with 6k off the sticker price plus a 4,500 dodge rebate wich the price came down from 33k to 23k do you guys think i did good on this buy? tks