Use the recommended NGK plug for the car, nothing else. Did I say NOTHING else !
They come pre gapped.
Most of us use Shell Rotella t6 5-40 and a good oil filter
You may want to clean the MAF sensor.
Read the DIY's threads on here.
186k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here