[sle39lvr]

RealOem lists these for my serial number:



Between Bosch and NGK, I've been reading here that NGK's are smoother and gives better mpg. So, on that note, NGK's they list for mine are NGK PLZFR6A11S. However, on ECS, they list NGK ILZFR6D11KT6.

So which one's should I pick? NGK PLZFR6A11S or NGK ILZFR6D11KT6

[AlanAZ]

NGK ILZFR6D11 (ECS # ILZFR6D11KT6) was the original 325 plug, ended in 2007. You don't want that. Plus $84 is expensive for a set, you should be able to get it for around $60.

325 page: http://realoem.com/bmw/showparts.do?...17&hg=12&fg=05

The non-ended part number for your car on Realoem is 12122158253, which resolves into:

Spark Plug "High Power" Bosch FR-7-NPP-332 NGK PLZFR6A-11S (5987) (6 Per Car)

BMW is using a common part number for both a Bosch and NKG plug (PLZFR6A11S).


However. Until just recently, Realoem had a later NGK plug listed just for the 328 (was never listed for the 325): NGK LZFR6AP11GS (from 12/2009 to present) BMW part 12120037663

See this thread: http://www.e90post.com/forums/showthread.php?t=548904

and this website: http://www.4wheelsautoparts.com/bmw-...gs-p-2919.html

and BMW of South Atlanta still has it listed for a 2008 328i:

http://parts.bmwofsouthatlanta.com/products/SPARK-PLUG-NGK-LZFR6AP11GS/3476899/12120037663.html



My guess is that with the sunset of the E90, BMW is consolidating parts, now specifying a part that will work for both the 328 and 325. If you go to the realoem link for the 325 above, you'll see that the non-ended part is the same 12122158253.

I'd use that latest NGK plug, LZFR6AP11GS. Either way, NGK ILZFR6D11 is not the right plug, it was never specified by BMW for your car.

[sle39lvr]

Wow, ...this just got a little complicated

I will read the threads you have posted. I do not have problems putting the premium, more expensive one since I am doing at 50K miles to improve smoothness, mpg, etc.

I would love to hear from few people who put LZFR6AP11GS on their N52.

[Express]

i just installed them in my N52.. work great.

[sle39lvr]

So NGK LZFR6AP11GS.

What should be the gap for these?

[AlanAZ]

They should be pre-gapped. The previous plug was 0.044. Measure them all, most should have about the same gap, adjust to that if needed.

There's a DIY for a 330 a bit further down this sub-forum with good info.

[sle39lvr]

Thanks.

I thought different plugs have different gaps even though it's the same engine. Guess not.

[AlanAZ]

Sorry, I wasn't clear. I don't know the gap for this plug. They are pre-gapped, and at a BMW dealer, are probably put in without checking. I was suggesting measuring the gap on all the plugs, and if any are different than the majority, adjust them to that, what ever that majority gap happens to be.

[sle39lvr]

So NGK LZFR6AP11GS should be pre-gapped correctly from the retailer, just check for inconstancies correct?

[AlanAZ]

Pre-gapped at the factory. Yes, check for inconsistencies.

Post was the gap is, curious to see whether it's the same as earlier plugs.

[sle39lvr]

Can anyone give me the gap I should have for NGK LZFR6AP11GS?
I know they should be pre-gapped from the factory, but I want to make sure..

[sle39lvr]

0.40 or 0.44?

[sle39lvr]

Just put in the LZFR6AP11GS the other day. After 50K miles, stock plugs were somewhat bad, but not horrible. Car feels smoother and there is definitely a 2-3mpg improvement.

I want to thank who replied here, especially AlanAZ.