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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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