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Discussion Starter · #1 ·
Didn't see anything about this in a search.

Looking ahead to a spark plug replacement. The parts sites I'm searching show two different plugs which they both claim to be OEM:

Bosch ZR-6-SII-3320
NGK SILZKFR8D-7S

The site says the Bosch are "not for cars that use ethanol fuel", while the NGKs are "for cars that use ethanol fuel".

Anyone have any experience with this? As I mentioned, they both are referenced with the same OEM part number (004 159 64 03).
 

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2012 SLK350
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1,374 Posts
Didn't see anything about this in a search.

Looking ahead to a spark plug replacement. The parts sites I'm searching show two different plugs which they both claim to be OEM:

Bosch ZR-6-SII-3320
NGK SILZKFR8D-7S

The site says the Bosch are "not for cars that use ethanol fuel", while the NGKs are "for cars that use ethanol fuel".

Anyone have any experience with this? As I mentioned, they both are
referenced with the same OEM part number (004 159 64 03).
The Bosch ZR-6-SII-3320 plugs are OEM replacements for the USA R172 350, the only difference from the original factory plugs in my car was that they had the Mercedes star symbol on them.

If you are interested, here's my write up on swapping out the plugs: http://www.slkworld.com/slk-r172-cl...-ignition-coils-r172-3-5l-v6-m276-engine.html
 

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2006 SLK280
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1,237 Posts
Manufacturers can (and do) switch suppliers or have multiple suppliers for the same part during production, so it is possible for more than one part to be truly OEM. The same is true for R171s.

Either plug would fit the bill, use whichever one you are more comfortable with.
 
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