best spark plug for M50TU

[scottinAZ]

Its time to change out the plugs in the motor, and I want some input from you guys.

Has bosch supers in it with two side electrodes. Pretty well worn out, so I believe this to be the cause of a low rpm (1000-1500) rpm stumble under load.

Are multi-electrode plugs needed for piston clearance (I wouldnt think so) or did someone just stick some gimmicky shit in the motor at some point.

What are the popular Bosch and NGK plug numbers for an otherwise stock M50TU?

[kalib0y]

NGK are s consistently better plug in most make cars. I have heard of some people have issues with Bosch in thier BMWs

[jclar]

When I was looking around for parts to refresh my M50TU it seemed like the NGK BKR6EK were the most recommended ones.

[Leo_328i]

M42s recommend BKR6EK as well but I run BKR5EKs and I find that it runs SO MUCH BETTER than before. The difference between 5 and 6 = lower the number means a hotter spark.

[Adrian_Visser]

M42s recommend BKR6EK as well but I run BKR5EKs and I find that it runs SO MUCH BETTER than before. The difference between 5 and 6 = lower the number means a hotter spark.

NO! The heat range has nothing to do with the intensity of the spark. A hotter plug dissipates less heat to the cylinder head and stays hotter at all times, this keeps deposits from forming on the plug while idling and running rich thus keeping the plug from fouling (good.)

However if the engine is put to heavy use the hotter plug may become a source of pre-ignition as it starts to glow (very bad.)

Pre-ignition can destroy an engine very quickly!

Stick with the stock plug.

[JdmEuroNorth]

OEM Plug, bosch or NGK. Check your service manual and put the right plug in, at the right torque with the proper gap.

Don't think you're smarter then the square head who engineered the engine, because you aren't! lol

[scottinAZ]

When I was looking around for parts to refresh my M50TU it seemed like the NGK BKR6EK were the most recommended ones.

Thanks, Just installed a set of these.

Expensive little bastards arent they...........


($5.59 ea)