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The BPR6EKN has 2 ground electrodes, each side of the tip. As specified for the Turbo SE (and later). The other reference will be for a standard plug, as used in older 9xx engines.

I have made many mistakes in my life. Buying a multiple Lotus is not one of them.


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Hi Filip,

The NGK BPR6EKN multi-ground plug is available with two part numbers. 6757 and 1128.

Both are the EKN type and both have the two ground design.

I think Steve is exploring this.

The older engines use the "ES" plug.



Edited by AndyPG
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23 hours ago, stevefh said:

what is the difference between the NGK BPR6EKN multi-ground with number 6757 and that described as spark plug with number 1128

Hi Steve,

After a quick check on the NGK website, 1128 is the old NGK stock number and 6757 is the new stock number for the BPR6EKN plug.

They are the same plug.


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  • 3 weeks later...


I just bought four new spark plugs (NGK BPR6EKN) for my S4s. The manual says that they need a gap between 0.9 and 1 mm. The NGK site states a gap of 0.8 mm from new for the BPR6EKN.
So, should I widen the gap from 0.8 to 0.9 and if so, how could this be done? With a standard spark plug with only one side electrode it's pretty easy, but this one has two of them and I didn't find any advice in the net how to do this without breaking the electrode.

Any comments would be highly appreciated.



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Hi all, spoke to NGK She said they only had 1128 listed but 6757 may be used outside the U.K. but she had no knowledge of it.she also said the gap was set at 0.8mm(didn’t mention 0.032”) and they didn’t recommend changing it . I said the lotus manual for my esprit says 0.9 to 1.0mm and I had told them this many years ago. So I started to use BPR6EIX-11,which are set at 1.1mm. I did this because I have the MSD 8224 coils with max 4000 volts allowing me to increase the specified gap by a max of 0.12mm giving new spec of 1.02 to 1.12mm. I did not do this for power ,mileage or longevity but just because the gap was too small for the S4.

I have not been able to track my mileage as I have been running rich for ages, including when using BPR6EKN, that’s why I am currently looking at the system for leaks and the charcoal canister set up.

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