im at 95k with the original plugs. no issues
I waited till like 100k to do my spark plugs on my 2013 Crosstrek, they were still good just not as efficient
Just traded in my 2015 Forester with 219,000 miles and the original spark plugs.
NGK Laser Iridium 94124 is the OE plug. Just stick with the OE Plug.
For spark plugs I always used NGK because that's what Motorcraft actually uses if I remember correctly. Autolites are complete garbage and always fouled out the few times I used them.
You can honestly just run stock plugs on the 1.8 with OTS tuning for stage 1/IS20/38. I ran these same VW/NGK "RS7" plugs including track use for thousands of trouble free miles.
I forgot to mention that I installed brand new pre-gapped NGK spark plugs two years ago
I like NGK, but you can't go wrong using what the manual calls for.
I bought these when I did my last tune up and plug swap just to try. I noticed zero difference in power or mpg.
Now that I've done the job, I can't tell if it's just in my head but the car seems to have less power now. It was already a sluggish engine to begin with it but it feels like I need to floor it even more. Also, the gas mileage has dropped from 25 MPG to 22.5 MPG.
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