Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance How long does synthetic oil last?

I usually run my Mobil 1 for 5K and then change just the filter and go another 5K and then do a complete change again. Also I've changed the MTX fluid every 20K, starting at 6K, then at 26K and recently at 45K where I added Mopar friction modifier. Damn 106K and you have the stock waterpump, when did you change your coolant and how often I did mine at 30K and was thinking of having the w/p changed at 60K when I do my next coolant flush