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    How to find out the ZDDP

    I'm running an old flat tappet V8 so obviously I'm looking for a high zinc oil. But the question is, how do I actually find out the ZDDP of an oil? Will any multi purpose oil that's also meant for diesels work? I'm looking at 10w40. Can I just use a Shell Helix or a Fanfaro with the right viscosity?
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