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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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