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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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