Its not tighter clearances that warrant thinner oils, bearing clearances don't get tighter with modern engines or they were not necessarily loose on older engines. The main thing that drives lighter oil in modern vehicles is fuel economy standards. It's not going to mean much to you but when the manufacturers produce millions of vehicles and they can lower fuel economy 1 percent then it stacks up and makes a big difference.
I'm not saying everything will be fine with 20w50 oil, or even 10w30 but thinner oil is not a "requirement" for modern engines, its only what they recommend for new standards. With that said, if they recommend 0w-20 then its should be just fine for that engine.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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