The compelling case for using Mobil one is that I could get it much cheaper than Castrol (see my op), and it's still a good oil
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I didn't pick the oil because of ZDDP content nor was I trying to estimate anti-wear properties (other than whether it would be broadly as good as the Castrol), I only brought ZDDP up as I was concerned that if it was higher than the Castrol oil that the cats could suffer in the long run.
But good points otherwise, thanks for the input
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Any idea if ZDDP is limited to certain levels in API SM/SN oil specs?
I know BMW recommends (recommended?) Castrol, but they now also recommend Shell. If they have stopped recommending Castrol oil, that of course doesn't make it unsuitable now, it's just not the one they promote anymore as they now have a deal with Shell. In that light, that is why I went for Mobil one (and it's a known good oil). Just I'm not sure about the cats!
