I've been picking the brains of my local car club about this and it seems like we'd want to run diesel oil (CJ-4 rating). This is what I got from there
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People run diesel oils (HDEOs) all the time in gas engines, it's rarely any issue at all. In fact, I believe in many benefits to this for turbocharged gas engines because these oils typically are more tailored to turbochargers. They typically have higher TBNs as well which means longer oil life and a better base oil to start with (rather than just souping up crappy base oil with additive pack). The only way to know for sure what the ash content is, is to look at the UOAs (Used Oil Analysis) on a place like BITOG. There are specific forums for HDEOs as well as Sx-class oils. Many HDEOs meet SM or whatever specs anyway, so it doesn't matter much.
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