Plug choice?

[e21Mark]

Just wanted to get peoples experience, when it comes to choice of spark plugs.

When I bought my E30 M3, I gave it a full and comprehensive service almost immediately. It had been fitted with NGK Iridium plugs but I replaced these with the OE Bosch items. I did that after a passing comment by a local workshop, where they said they had suffered some running issues, down to the Iridium plugs.

I've also noted a considerable price difference between brands.

4 x Bosch - £8
4 x NGK Iridium - £32
4 x NGK - £12
4 x Denso Iridium - £34
4 x Champion - £21

So what plugs do you use and why?

Have you suffered any issues with the alternatives?

How often do you change your plugs?

[stevesingo]

Denso IX27B, which is slightly cooler than the recommended Denso IX24B. I chose this plug as it was the easiest brand to choose a cooler plug at the time. No running issues with it at all.

Change plugs every two oil changes, so about 9-10k miles. They would probably last longer than that bu old habits and all that.

Edited by stevesingo on Monday 17th November 10:02

[e21Mark]

I've never considered the Denso plugs. Might give them a look now though.

[mark.c]

Bosch (X5dtc of the top of my head) as you say they are cheap and I can't say Ive ever had an issue with them Boggo engine though which didnt require anything cooler etc. Perhaps slightly biased since they are cheap I tend to change them at each oil service/once a year.

[E30M3SE]

Bosch X5DTC. Never tried anything else so no not of any potential issues.