16x NGK LZTR4A-11 Standard Spark Plugs For JEEP GRAND CHEROKEE 5.7 04/05-->
£60.57
Evidence of under-torqueing can be seen via the crush washer gasket not being as thin as expected (unless it's a tapered type plug). NGK Standard Spark Plugs. Shown below is an over torqued spark plug that sheered due to user installation error.
