2360 votes
NGK actually makes the original plugs for the mk3 focus (because the engine is based on a Mazda L series) so if you're doing plugs for a focus using NGK will be just as good if not better than the "oem" brand
As long as you use the right type and gapped correctly, then you are fine. NGK, Autolite, Motorcraft, bosch, all are fine.
I have been running them for 50,000 miles with is20 then is38 setup. Work perfect.
Damn $40/plug, I have a nissan altima 2012 and got the most expensive one at $30CAD/plug NGK iridium laser and it was out of necessity as cheaper ones was out of stock during lockdown.
I've seen with a digital tachometer a 1,000rpm difference between a laser brand spark plug and the oem ngk spark plug in a chainsaw. So for me it's what the oem uses is what I put back in.
I just ordered new spark plugs and an oil filter as well.
I just did the change myself on my Gen 1 Mazda 3. It's simple! I used NGK Laser Iridiums.
The NGK's worked beautifuly.
I used NGK, 6 month no issues.
Get NGK plugs instead...mine have been working great.
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