Spark plug NGK or Denso

I've had perfectly fine luck with aftermarket coils, 4 years 2 cars no faults. I'm running factory RS7 plugs, I forget if they were NGK or Denso, but they are 1 heat range colder. Working fine with stage 2.

I like NGK’s. No longer have my E28 but in my 944 i still run NGK’s.

I suggest buying a known high quality replacement, not being picky about the exact spec, and seeing if that makes a difference. At under $5 it's a minimal cost and effort. Based on the what this engine was likely copied from, I would pick a NGK BPR4ES or BPR5ES from a vendor that doesn't have a reputation for NGK counterfeits.

I removed the Champion plug and replaced it with an NGK and on the first pull it ran.

I use NGK Iridium's in my generators. People say I'm nuts for spending the 10.00 for one, but I never have problems starting on gas or propane which is what I use with Iridium's, and plus you'll probably never have to replace it either.

I just replaced the stock plug in my Champion inverter with a NGK and it runs significantly better. No more random misfires.

I threw the nasty plug away, installed the NGK plug and it now starts on the first pull and runs smoothly.

NGK all the way, 100% of the time.

I don't trust hks, too many copycat them.

I tried it once after reading about that. Used ngk plugs. One of them seized and snapped on me trying to remove it. Only plug I’ve ever had seize.

Ngk dcpr6e, DONOT use autolites...