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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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