Hello,

I checked on ngk.com, and the part locator gave me this copper plug for my 97 SL500: BKR5ES.

But that's a resistor type. Does anyone know the correct NON-RESISTOR NGK part number for my engine?

Thank you!

With the exeption of Bosch, I have not found a readily available line of non-resistor plugs for Mercs. Fastlane can have you a set of proper plugs in a couple of days.

Duke

W9DC0 on your chassis has been changed to F8DC4 , Bosch Super , copper core , non resistor.
NGK replace is BCP5ES..

Here is cross charts

http://www.clubplug.net/bosch_ngk.html

I had the wrong numbers listed on my previous post, so I deleted it. I had 560SEL's on the brain I guess.........
Corect plug WAS F 9DCO, but Arthur is correct it was changed to F8DC4. Back when the car was newer, ie "in the day", the other recommended plugs were BERU 14F-9DUO, or Champion C12YCC
Gilly

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Thanks for the correction, Gilly..

I might add that I had done a few NGK copper changes from the F8CD4 as a kinda experiment on two of my personal cars , and the findings were excellent for the first 5K miles , but after that they started to have problems at idle.. I went back to Bosch and no more trouble after several Ks.
I also tried NGKs partner NTK O2 sensors and did find them to be better than the Bosch. I did scope comparison charts and found them both faster and cleaner , and am awaiting longevity results...

Thanks guys for the PN. But if anyone's had trouble with NGK's, I've heard that there's a difference between US-made and Japan-Made ones. When I used to ride bikes (I'm a UJM fan), my friends swore on the Japanese NGK's.... But UJM's are cheap, and my SL is no toy to screw with, so I just might stick with Bosch unless I hear any testimonials for Japanese NGK....

ngk