Best Plugs For Stock Car

[airgrabber]

Looking for what would be the best plugs for a stock 99 Regal GS. It's my daily driver so not looking for any mods just best gas mileage.Thx

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[87gninpa]

I run the stock Delco iridium plugs in both of my cars and no complaints. Usually change them every 80k and they always look like new, can probably go a lot longer.

 

[murphinator]

no interest in mods and want mileage I gotta agree with 87gninpa and say stock delco iridiums and yes they can go longer than 80k ,I have a 2500hd with 182k that has just started to miss I think its time for its first plug change lol

 

[87gninpa]

Wow, 182k? I need to leave mine in longer...

 

[Powertechn2]

I guess....

At least ls engines don't have the ferd breaking plugs off in head issue hahaha. Ferd silliness.

 

[jdredd]

I've used Autolite 104's for stock to mild modded with no issues for past 10 years or so. Cheap and work well.

If going for MPG, i'd suggest a few simple mods and get the MPG up there pretty well. My old 98 GTP before I scrapped it was mostly a highway driver only,
and was getting around 500-550 miles on each fill up, and usually had 3 gallons left in it. Was high milage car.. I had converted it mostly back to stock. Still had a S1X CAM,
3.4" pully, and I left the top of the air box off, cause well... I couldn't find it. If i had gutted the cat, probably could have tuned a bit more to get a few mpg out of it. Tuning was key.
Ran it a bit on the leaner side of things and what not as I wasn't racing around in it. Took a few days of driving to work and back (100+ mile trip) and got the tune down pretty
good. The trans was old and slipping and drove it like that for 4 years. That probably caused a bit of a hit possibly.