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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I'd go with the cap. The one time I bought the oil from the dealer they put in 5-40 and everything I've ever read says 5-40.
Nice truck by the way. Interesting how it doesn't say RAM 2500 like all the other Mexican RAMs we've seen on here. Guess there's no consistency in badges in Mexico either.
Even my kids Avenger with 2.7 uses 5w20. He got an oil change at Lube It in Canada here and the guys there said most cars now use the 5w20. Even other brands.