Spark Plug Question

[Bill Luby]

I'm changing plugs and wires and wanted to know if anyone ever used NGK Iridiums in a 2004 2.5 and did they improve mileage or perfomance. I'm also getting NGK FX58 wires.
TIA, Bill.

[radio head]

If your 2004 is a PZEV model, you'll need the FX102 wires.

FX58 - two "shorter" wires, two "longer wires", use when coil pack is offset on intake.
FX102 - all wires of equal length, use when coil pack is centered on intake.

[RobLog]

Iridium plugs are unlikely to have any affect on mileage or performance. They reportedly will last 90-100k miles, longer than platinum plugs (60k miles) and a lot longer than copper plugs (30k miles). That is their chief, maybe only, advantage. For some drivers, that is enough to justify the additional cost by not having to change the plugs quite so often.

Personally, I would only use them if I was putting on big miles every year.

[RedGeminiPA]

The OEM Denso Iridium plugs that were in my Honda-powered Saturn Vue V6 were at 115,000 miles and still performing great when I changed them last year. They're what I'll be going with when I change them in the VDC.

I got them on sale at Advance Auto, and the price wasn't much worse than the average plugs I priced at the time. They're $8.99 each right now, which isn't really that expensive.

http://www.saturnfans.com/forums/sho...ht=spark+plugs

[cardoc]

Make sure they are of the same heat range on that H6.

[RedGeminiPA]

You have to get the ones listed for the H6... haha

Advance only lists 2 different Denso Iridium plugs for the H6 - the slightly cheaper ones (by 50¢) aren't full iridium.

[jogosub]

I have used NGK iridium plugs on all my cars every time plugs were to be replaced. They last a long time but I am not sure about any increase in performance or mpg improvement. I haven't measured that although there are some claims about the improvements.