spark plugs
Posted: Fri Sep 03, 2010 5:30 pm
can anyone tel me the number of NGK plugs for my M20 2.5 engine
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Posted: Fri Sep 03, 2010 5:52 pm
In the US it is NGK ZGR5A. Probably the same on you side of the pond.
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Posted: Fri Sep 03, 2010 6:09 pm
I have seen ZGR5A's fitted to m20 engine but BPR6ES's are what you need!!
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Posted: Fri Sep 03, 2010 6:28 pm
I went to get some BPR6ES plugs today but my local motor factor didn't stock them, and only had Bosch. I didn't get them as i've heard nobody seems to like using Bosch plugs. Why is this ? BMW used Bosch plugs from factory...
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Posted: Fri Sep 03, 2010 6:34 pm
bosch plugs are shite, they last nowhere near as long as ngk r's. ive always used ngk plugs in all my cars and cars that i have serviced for peolple... ngk bpr6es are the best plugs to use on a b25
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Posted: Fri Sep 03, 2010 7:01 pm
I hate Bosch plugs too, NGK much, much better in my opinion. I don't know why BM used Bosch (in some E30 engines) but then I guess Bosch were/are on the books for all sorts of other electrical bits (lights, AFMs, all the rest) and so they got the sparks contract.
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Posted: Fri Sep 03, 2010 7:14 pm
whats the difference between ZGR5A's and BPR6ES's? Ive fitted ZGR5A's, but now I'm worried I've fitted the wrong ones 
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Posted: Fri Sep 03, 2010 7:15 pm
bosch are not great, but at least they work!! anybody tryed the cheapo denso shite ecp sell? NGK ftw!!!
Posted: Fri Sep 03, 2010 7:47 pm
I'm looking at changing the plugs on my 325i this weekend, went on the NGK website and it says use ZGR5A but on here it's saying BPR6ES, now I'm confused!!!
Posted: Fri Sep 03, 2010 8:47 pm
In the US guys seem to run BPR6ES if you have a decent CR because its a colder plug than stock other wise ZGR5A (stock) which is a comparable plug to the old Bosch Supers. Being you guys are blessed with higher CR then the 8.8:1 we get in the I's over here I'm sure BPR6ES works great. Right now I'm running ZGR5A in my Hartge H23 with 10:1 compression with no issues, but I just ordered a set of BPR6ES to see if it makes any difference.