Best Spark plug for Ford Focus

I changed my coils and spark plugs and it fixed this same issue

I love my brisk spark plugs from EMS. Definitely better for me than the NGKs I ran. Last longer and don’t open up as fast.

I recently changed my spark plugs on 2012 Ford Focus. I used Bosch and got a 3 MPG boost.

I run NGK on my 15. The car runs great doesn’t miss. I used OEM Denso 5339 but they lasted 10-15k but then I tried NGK 92182 and they’ve lasted bout 40k so I’ve had no issues with them both of them Iridium.

I still put a small dab even though the NGK plugs recommend against it. I change my plugs every 15-20k because I have a tuned Focus ST. I already went through 3 sets of NGKs with no problems doing the small dab

I ran stock plugs for a while and they got chewed up fast. On NGks now and even pushing 29 psi they keep the gap well.

Until I replaced the plugs, coils, alternator, starter, battery and cleaned connections all I could, this problem persisted and my vehicle killed a coil / 2 every season.

For the intake i would recommend k&n filters systems, racing plugs are not even worth it, better look it up some NGK iridium

So, I changed spark plugs in an old Ford Focus 2001. And currently there's no way I can get the original Motocraft spark plugs, so I bought and installed the NGK ones which are supposedly compatible with my vehicle. I used them a week, but since the start I noticed great differences in size in the threads and in the shape of the head. Is this a problem?

I bought some NGK from RockAuto and they only lasted me 15k miles. I just ended up buying the FoMoCo ones from the dealer.