Picked up some plugs for my mrs little polo and it had bosch fr7ldc motor factors gave me bkur6et-10

I know on the ngk the higher the number the colder the plug but what about Bosch is a bosch 7 colder than an ngk 6

Thanks guys

There is no correspondence in heat range numbers between plug manufacturers.

You can download the full NGK car and light truck plug book in PDF format or use their Plug Finder software via the web.

From memory on Bosch plugs it's the other way; Higher the number the hotter the plug... or is that Champion?... Either way, as BT says there's no corelation between makers numbers.

According to THIS site a bkur6et-10 is equivalent to a FR7DCX so it seems like the heat range would be about right.
I used to sell measuring spark plugs with integrated cylinder pressure sensors to engine manufacturers and developers and used that chart with no comebacks.

HTH

Neil

Common Q on turbo sites, here's a handy one I found:



(From sparkplugs.com)

thanks for that little chart that was EXACTLY what i was after

Be aware NGK and Champion are gradually changing the way they number plugs.

Also suffixes are being used to identify a version of a plug tailored to a specific engine this usually just indicates it is supplied with a different gap.