Either a 14mm or a 9/16th 12 point socket will work the thinner the better as it gets a bit tight in a few spots . (I turned an old 9/16 down in the Lathe)
My "Theory" is when you go 20 under or more you're through the Toyota hardening so the crank is no longer resistant to scuffing if it comes in contact with the bearings.
This leads to more scuffing and more clearence in time you get to the point where the oil pump can't keep up at low rpm or...
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