I have always used double plat or ngk laser iridium with no issues in my 2.5.
Pros: no issues
Owner reviews for spark plug
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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.
Pros: keeps the gap well
Cons: stock plugs chewed up
Vehicle:
Ford Focus
I run the IS38 FBO and beat the crap out of my car and use stock heat-range Rutheniums.
Pros: durable under stress
Vehicle:
Volkswagen Golf
I use [Denso IKH24's](https://www.fcpeuro.com/products/audi-vw-spark-plug-denso-ikh24). It's the projected tip version of the Denso plug EQT has recommended on their FAQ (IKH01-24).
Pros: readily available, FCP warranty
Vehicle:
Volkswagen
Mileage: 10000 km
Part number: IKH24
Spark plugs. NGK 4 lyfe
Pros: NGK 4 lyfe
NGK spark plugs are preferred in rotary engine (RE) Mazdas and Nippondenso is the only acceptable substitute that I ever found. We dealership technicians, always found it remarkable how a set of Champion or AC spark plugs could instantly cripple a rotary powered Mazda.
Pros: NGK spark plugs preferred
Cons: Champion/AC spark plugs cripple
Vehicle:
Mazda
My 2017 Jetta SEL with LFER7BHX 9512 plugs starts/runs fine at 50076 miles, 0-100 degrees F.
Pros: starts/runs fine
I ran Beru RS7 plus which are one step colder when I tuned stage 1 and they didn't last at all. Might have been under 10,000 miles. Recently went with NGK plus that APR reccomends for stage 2 and so far so good. No misfires since.
Pros: no misfires
Cons: didn't last
Mileage: 10000 km
I think I just went back and got the Bosch. Couldn’t return either because I jacked up the nips trying to tweak them off ????
Cons: jacked up the nips
Vehicle:
BMW
Don't think the platinums give much of a performance advantage and they foul faster if you've got any oil burning going on...
Cons: foul faster
Vehicle:
BMW
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