On NGK s website it says laser iridium (the oem ones) are good for 100k miles.
So far, the OP is on to something. I’m using these plugs and that are great. Next I’m going to try the NGK ZFR6T-11G Copper Nickel. These are OEM for later 2.5 motors. I have early 2.5. I’m curious how these slightly bottler plugs will run and especially since I run premium at all times. I’ll report back. But good find OP. These work great.
The 94553 Iridiums... the tip will last longer, but the gap will widen quicker as the ground electrode does not have a platinum disc on it like the Laser Platinums, so, the Laser Platinums will last longer.
The NGK iridium I mentioned before does not have the correct reach. The website says they are the same, but they are not. I think the database is wrong. When I go back to the copper NGK that does have the correct reach, the car drives better. I had all three in my hand and the iridium is shorter from the end of the threads down (reach). NGK websites say they are the same .75 reach. They are not the same in my hands. The copper plug is. NGK 4435.
Threw new plugs in it (NGK BKR7E; I like that 3 of my cars run these now... makes life simple)
I swapped out to APR coil packs and NGK-R7437-9 plugs at the recommendation of APR after going stage 1. No issues after about 8K miles.
NGK has NEVER let me down in any of their products. I use them in my American and Japanese cars, trucks, motorcycles, lawn mowers, leaf blowers, weed heaters, and chain saws.
You can get the champion version of the RS7 plugs for less than $20 a plug and they’re working great on my car!
I changed spark plugs to NGK laser platinum plugs with a 0.32 gap. The issue only arouse after I got the tune.
Went through both ngk and autolite, didnt like they're spec'd plug for it.
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