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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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