E90 N55 Spark Plug Part Number

princelybug · 02-09-2015, 12:05 AM

I tried to search, but couldn't find the answer to my specific question(s) regarding Bosch spark plugs for the E90 N55:

1. Bosch part # ZR5TPP33-S R6
2. Bosch part # ZR5TPP33 R8

I know #1 is the proper OEM plug for my car.

1) What's the difference between #1 and #2 (R6 vs. R8)?
2) Will there be any ill effects if I were to use #2 vs. #1?

princelybug · 02-09-2015, 09:26 AM

After doing some research, it looks like the heat range (3rd digit of part number-5) is the same for both plugs.

Does anybody have any insight on what the "-S" and "R6" or "R8" in the part numbers represent?

princelybug · 02-10-2015, 03:30 PM

I ended up calling Bosch tech support @ 888-715-3616. I was told the "R6" or "R8" at the end is just a manufacturer's code (I'm guessing batch number or something similar) and doesn't signify anything I terms of the plug itself. I was told both of the above plugs are one and the same.

The "-S" however, does signify something. It is an updated version of the original plug. The "S" model has an updated "ground strap."

That's the answer to a question no one's asked other than myself. Cheers.

02-09-2015, 12:05 AM	#1
princelybug Second Lieutenant 60 Rep 227 Posts Drives: '11 LBM E90 335i M-Sport Join Date: Nov 2014 Location: Orange, CA iTrader: (6)	E90 N55 Spark Plug Part Number I tried to search, but couldn't find the answer to my specific question(s) regarding Bosch spark plugs for the E90 N55: 1. Bosch part # ZR5TPP33-S R6 2. Bosch part # ZR5TPP33 R8 I know #1 is the proper OEM plug for my car. 1) What's the difference between #1 and #2 (R6 vs. R8)? 2) Will there be any ill effects if I were to use #2 vs. #1? __________________ '11 LBM E90 335i M-Sport (Current) '12 AWP II MDX Tech (Hers) '07 NBP TL Type-S 6MT (Sold) "From a Lifesaver to a Soulsaver" <-- Click
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02-10-2015, 03:30 PM	#3
princelybug Second Lieutenant 60 Rep 227 Posts Drives: '11 LBM E90 335i M-Sport Join Date: Nov 2014 Location: Orange, CA iTrader: (6)	I ended up calling Bosch tech support @ 888-715-3616. I was told the "R6" or "R8" at the end is just a manufacturer's code (I'm guessing batch number or something similar) and doesn't signify anything I terms of the plug itself. I was told both of the above plugs are one and the same. The "-S" however, does signify something. It is an updated version of the original plug. The "S" model has an updated "ground strap." That's the answer to a question no one's asked other than myself. Cheers.
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02-09-2015, 09:26 AM	#2
princelybug Second Lieutenant 60 Rep 227 Posts Drives: '11 LBM E90 335i M-Sport Join Date: Nov 2014 Location: Orange, CA iTrader: (6)	After doing some research, it looks like the heat range (3rd digit of part number-5) is the same for both plugs. Does anybody have any insight on what the "-S" and "R6" or "R8" in the part numbers represent?
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