Hello everyone! This is my first post here, after reading on this great site for a long time lol. But anyways... I have a 12v Cummins B in my truck, with a few injector pump mods so it puts out a good haze of smoke if you get on it! But my question is, with my engine producing more soot in the oil due to more fuel, what would be better? To use a premium oil like Schaeffers 7000 & 9000 (I'm using the 15w-40 7000 now) and go strictly by UOA, or use a conventional like Delo or Delvac every 6,000mi (recommended OCI for B series in a Ram) I like to save money, but I would rather have a healthy long lived diesel! Thanks!