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 Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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