That should be fine for use with a toruque wrench, but like others have said, depending on the way the plug seats in the head, its between 1/4-3/4 turn. If theres a crush washer I usually go half turn after the washer touches the head.
2002 VW Golf TDI-Mobil 1 5/40 TDT
2005 BMW M3 BMW Twin Power 10/60
1997 John Deere Gator 4x2
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL