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The engine is built to require it. The inner specifications are of a tolerance to need that viscosity.
5w20
5w205w20
5 quarts 5w20
5W20
5W20.
A 2010 Jeep Wrangler uses 5W20 engine oil.
5w20 conventional
A 2008 Jeep Wrangler uses 5W20 engine oil.
5W20 is the recommended oil.