I have a friend who is a refinery engineer. He says that the difference is in the additives that different companies add to their oil. Switching to different brands means different additives, and that seals may swell or shrink due to the change in the additives. His advice is to pick a brand and stick with it. On another note, my wife's Suburban was using a quart every 3 thousand miles when it was brand new. Dealer said that was within specs. We switched to Mobil One and that cured the problem. I've gone to synthetics in all my cars now, but use Chevron RPM Delo in the tractors.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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