My '01 TL has over 86,000km on it. The plugs are supposed to be inspected and possibly replaced at 96,000km or 48 months. I already put some NGX Iridium IX plugs in my bike. Now, I'm thinking of putting some in the TL. Any comments?
Also, I've never changed plugs on this car. Is there anything special about the procedure? My standard procedure is: Pull wire, clean around plug with compressed air, remove plug, oil thread on new plug, install and torque new plug, proceed to next plug. Anything else?