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What oil would YOU run in this engine? Manual specifies fully synthetic: “SAE 5W-40; JASO MA, MA2; API SL; ACEA A3” I’m surprised that they specify the JASO MA/MA2 rather than MB as this not a wet clutch. Wouldn’t a JASO MB oil be a lower friction and “better“ oil in this engine? An...

Engine light came on in wife's 2013 Grand Caravan (115k miles). Cheapo scanner shows PO420 Powertrain: and low voltage for O2 Bank 1, Sensor 1: I'm making the assumption that the O2 sensor is the likely culprit and plan to change it out as a first step. Is this a good assumption given these...