Spark plug NGK or Champion

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.

My 2017 Jetta SEL with LFER7BHX 9512 plugs starts/runs fine at 50076 miles, 0-100 degrees F.

You can run NGK Rutheniums, i run them on with my is20 and no complaints either.

I swapped for Rutheniums, No complaints and its a easy job

Stick to NGK R7437s. They are pricey but the best plug for a tuned car forsure. I inspect the gap every 5k miles and replace every 10k. Mine are gapped to .022

I’d go with the recommended NGKs, buy from fcp euro and you only need to pay for them once. Those are what I run on APR stage 2.

I went ahead with an NGK Laser Iridium. Compared the ones from the engine and the new ones and were identical in shape and form. It does seem to work fine after testing it.

NGK Iridium, it’s what I get about everytime.

I've used Autolite plugs in my stock 2011 for 6 years. I wanted to try NGK's so I recently installed a set of Ruthenium NGK plugs. I haven't noticed any difference between the two brands.

I also just put in a set of NGK BKR7E's and gapped them a little large (.034) seeing as the ones I pulled out were at .043 That did nothing and the issue is still persistent.