What are the best spark plugs for Malibu Maxx 3.5L V6 ?

Car already has 123k km, start idling a bit rough and gas mileage is not at best..... I want to check and change plugs. Any recommendations what spark plugs good for this type of car?



How multi-electrodes plug works (Bosch Platinum+2 / Platinum+4) are they good with my engine ?



Should I replace ignition wire set as well? I know that wires aren't easy to check and diagnose.



Thank you for your input.What are the best spark plugs for Malibu Maxx 3.5L V6 ?Stick with the factory AC DELCO iridium tipped spark plugs. I have seen numerous issues with aftermarket plugs, Bosch included. AC Delco warranties their plugs for 100k, and their wires. They are designed specifically FOR YOUR VEHICLE, whereas aftermarket plugs (no matter how nifty the name or promises) are designed to be used across multiple platforms.What are the best spark plugs for Malibu Maxx 3.5L V6 ?Your original equipment spark plugs lasted for 123,000 kms. - that is excellent. Put another set of those in. I can tell you now that the aftermarket plugs won't last any longer.What are the best spark plugs for Malibu Maxx 3.5L V6 ?The Bosch +2 or +4 do not seen to do well in any application other than Inboard boats that have found to this day, the best option for your application would be the OE AC Delco plugs (that are platinum as well), the only other thing that I would use is a compatible NGK Platinum plug.