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

Question

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.

Answer 1

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.

Answer 2

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.

Answer 3

I read on another post somewhere to use a shoe/boot string. Choke the boot with the shoe string near the top below the ring and pull. Try to get a straight pull on it if possible and try turning them also. Wear gloves!