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5W20 and now 0W20 are specified to meet EPA demands.
Your EPA could care less how long your engine lasts. Only how little fuel it burns.
When asked about these light-weight oils a few years back, a local engine re-builder said he would recommend 20W50 for anyone interested in maximum engine life. I wonder if the oil galleys of the latest engines can flow such heavy oils.
5W30 full synthetic only for my 2016 and the others in my fleet as well.
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