maintenanceSpark Plug Service Torque Specsfor 2010 Buick Lucerne 3.9L V6 · FWDUnitslb-ftNm5 fastenersSeqComponentTorqueAngle—Cover Screws8 lb-ft · 11 Nm——Engine Cover Clips2 lb-ft · 3 Nm——Ignition Coil Bolt8 lb-ft · 11 Nm——Mounting Bolts20 lb-ft · 27 Nm——Spark PlugCriticalGap before install15 lb-ft · 20 Nm—📝 Suggest a correction to this torque spec