Disclaimer: Yes, I've spent time searching earlier posts... What oils are good for cleaning up a motor? The 3.5L V6 in my Trooper has 75k miles and presumably lots of carbon buildup due to high oil consumption. I've always run 5W30 (went from dino to to synth blend to Mobil 1 Tri-Synth back to dino) which I'm sure hasn't helped the consumption. I bought some Delvac 1300 15W40 tonight and plan to run it for 1,000 miles then change it out and possibly run it again. Any suggestions?