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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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