Agreed you don't get sludge using good oil - you get sludge from poor designs. Chrysler, Toyota and Volkswagen have had their share of sludge issues and it had nothing to do with the oil. But changing it more often would have prevented the sludge issues that plagued their designed and saved consumers millions (billions?).
Consumer Reports is the same outfit that declared Audis had the magical ability to accelerate in reverse, they are also the same ones that invented the Alar scare. Apparently the oil companies don't advertise with them enough to get favorable reporting.
The short of is that synthetics have the ability to carry more dirt and resist higher temperature extremes - nothing else. Your car's oil isn't "cleaner" because you run synthetic - driving it 5000-10000 miles simply means you oil is extremely dirty but hopefully isn't leaving it behind in deposits of sludge. The new variable valve timing systems use oil and oil pressure to control their cam phasers and they do not function well with dirty oil. GM learned this with their 3.6 engine, Ford learned it with their 5.4 engine - Chrysler didn't learn anything. If you have a "modern" engine with VVT 3000 mile oil changes are cheap compared to the repair cost these engines will need if you try to use extended mileage oil changes to save a few dollars.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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