[b]I've changed it twice with new filters each time in 1,500 miles and it looks dirty after 350 miles. I use 5 W 30 in the winter months due to the fact that I have to park it outside and Michigan winters are pretty cold. Any suggestions?. The engine, 302, only has a little over 70 K original miles, doesn't blow smoke, great compression, no knocks, ticks, pings, and no leaks. I am hesitatnt to use an engine flush because I have heard they can do more harm then good...any suggestions? Any one running Lucas oil treatment in their oil and tranny as well? :lol: