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I use 6 point sockets ordinarily just as you do. You will find some high strength bolts have 12 point heads. The Volvo connecting rod bolts long with the Volvo bolts for mounting Garrett T3 and Mitsubishi TD05 turbos have 12 point heads. That is why I have a 10mm and a 12mm 12 point 3/8 inch drive sockets in my tool box.
For Volvo torque to yield cylinder head bolts I use a 14mm 3/8" drive six point impact socket. Evean a Snap-On 6 point 3/8" drive socket breaks on those babies when the've been in there a while.
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