Originally Posted by luxuryrules
Book calls for spec MS-10725. Interestingly, Mobil1 no longer meets this spec, though I understand they used to. Royal Purple doesn't either. Red Line's 0w40 does, which is what I'm leaning towards.
Did you find somewhere that stated Mobil1 no longer meets this spec, or is it that they no longer pay to get their oil certified to that spec? Those are two different conclusions to their not listing the compliance with the Chrysler spec. I could not find anywhere that states what the requirements of MS-10725 are.
I do understand sticking with what the manufacturer specified if you do not have the technical experience which would make you comfortable using an oil that is labeled that it meets or exceeds the spec. I have been there.
Since there are oils that claim to meet the MS-10725 spec, that is your safest route. I see that the tech sheet for the last oil recommended for use in the Viper, Pennzoil Ultra Platinum 0W-40, states that it may also be used in SRT engines originally recommending Chrysler MS-10725 oil.