To go backwards, would there be any harm in running 5w20 in my out of warranty 2012?
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04 Dodge Neon SXT/2.0/MTX/5w30QSUD/PureONE/12mo

12 Chrysler T&C/3.6/6A/5w30PU/Wix/Looking for 10k miles

07 Chevy Impala/3.5/4A/Shop Pref/OLM