m20 spark plugs confusion

[markus_74]

Hello,

I have tried ngkbpr6es (made in France) and it is not good to my engine it it smootest but , likely to stall in the traffic.

Tried bosch w8dc R0 (made in China) except in cyl 1 that is bosch w8lcr R1 (made in germany).

Result is good and powerful engine

Today I try to change cyl 1 with same spark plug that is w8 DC new production with blue collar color(made in China) but it seem misfire.

What is the mean of R1 and R0? I see the w8lcr that is r1 has good sign of burning but R0 in cyl number 1 very clean likely not burn.

Does w8lcr is good for m20?

[markus_74]

I just see conversion table.

If the correct sparkplugs is w8lcr for 325i later version and then it is same with ngk zgr5a.

Bpr6es is same with wr6dc?

Some articles said that bmw ht lead has some resistant built in so need r0 sparkplugs?

W8lcr has r1 so it has resistant
W8dc has r0 so no resistant.

[Brianmoooore]

W8LCR is the plug BMW specify for post facelift 325i engines.
BMW leads have a high voltage resistor built into the plug cap, so can be used with unsuppressed plugs, but 'R' type plugs shouldn't cause any problems.

[markus_74]

Thank you Brian.

My engine is low comp 325i, I think 1990-1991, does is it post facelift?

What is the mean of R0, R1 until R6 in the side of bosch spark plugs?

And does use resistant plugsnwith this ht lead will reduce any spark and then reduce performance?

[markus_74]

I see now after open realoem.

Early 325i use w7dcr that is same with ngk bpr6es

Post 325i use w8lcr that is same with ngk zgr5a

And because my car is post model she loved with w8lcr or ngk zgr5a.

R0 or R1 is no problem as the original use R1