Quote:
Originally Posted by Quicksilvers
What time and mileage interval do you replace your Nissan OEM spark plugs? What are the best brand spark plugs to use on the 370z? If you know what is the correct ft lbs. of torque on the spark plugs for these 370z's?
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The FSM lists the torque as 14 ft-lbs (or 168 in-lbs) ... that's provided you don't lubricate the threads with anti-seize. If you choose to lubricate the threads, the instructions for the Denso plugs indicate that you should reduce the torque by approximately one-third (... otherwise you could stress the plug or damage the threads by over-torquing). An alternative to torquing (according to the Denso instructions), is to finger-tighten the plug and then tighten it between 1/4 to 1/2 turn. I chose to lubricate the plugs and torqued them to approx. 115-120 in-lbs ... which turned out to be between 1/4 and 1/2 turn after finger-tightening.