[motionex]

Hello all, quick question. A friend of mine has a set of NGK 97506 spark plugs that he gave me to fix an issue my car has with misfires and bad start up (will be doing injectors and coils later this week as well to be safe). However, doing my research, these are two steps colder than stock plugs. From my beginner mechanical understanding, these are intended for cars that make a lot more power than a stock 335i does. Is there any danger of running these on a stock configuration? My friend says a higher mileage vehicle can benefit from a colder spark plug, but I haven't learned enough yet to know if thats true or not. The N54 already makes me nervous enough with all of its issues, don't want to hurt the motor any more than it potentially already has been.

This is a link to what he gave me:

https://www.ecstuning.com/b-ngk-part...six/97506~akt/

[LMB335IS]

Originally Posted by motionex

Hello all, quick question. A friend of mine has a set of NGK 97506 spark plugs that he gave me to fix an issue my car has with misfires and bad start up (will be doing injectors and coils later this week as well to be safe). However, doing my research, these are two steps colder than stock plugs. From my beginner mechanical understanding, these are intended for cars that make a lot more power than a stock 335i does. Is there any danger of running these on a stock configuration? My friend says a higher mileage vehicle can benefit from a colder spark plug, but I haven't learned enough yet to know if thats true or not. The N54 already makes me nervous enough with all of its issues, don't want to hurt the motor any more than it potentially already has been.

This is a link to what he gave me:

https://www.ecstuning.com/b-ngk-part...six/97506~akt/

It won't hurt it but it will probably run like shit. If you have a stock setup there's no reason not to stay with OE plugs.

[b92]

These are probably too cold for your application, but as long as they're gapped correctly (0.022") they should be fine. You might experience some stumbling during cold starts though.

[b92]

Originally Posted by thelightning

And fouling as the deposits don't burn off.

Don't do things that are not widely reccomended. There is so much info available if you look for it. Stop going against the current.

He said he got the plugs from his friend so it's not like he had his pick of the litter, he was simply asking if there would be any issues.

I agree regarding the fouling though. These plugs are more expensive, won't last as long and won't run as smooth. Even if OP is getting these for free, spark plugs are so cheap that it’s not worth running anything outside of spec.

[motionex]

Originally Posted by b92

He said he got the plugs from his friend so it's not like he had his pick of the litter, he was simply asking if there would be any issues.

I agree regarding the fouling though. These plugs are more expensive, won't last as long and won't run as smooth. Even if OP is getting these for free, spark plugs are so cheap that it’s not worth running anything outside of spec.

Thank you. I already got a set of Bosch OEM plugs so it's a non issue at this point, friend was just doing me a solid.

This thread only exists for the simple purpose of just making sure that what I understood to be the case was actually the case, dunno why some people have to find a way to an elitist at every possible opportunity. Thanks all for your input.