If the number stamped into the metal part of the spark plug body is the same on the O'Reilly NGK as the BMW-branded NGK, then I think you can safely conclude it is the same plug. The problem with the Bosch plugs is that the Advance Auto Parts Bosch plug does NOT have the same number stamped into the plug as the BMW-branded Bosch plug. The two numbers have completely different formats. Hence, the uncertainty.
Originally Posted by DashingDaryl
I bought my NGKs from O'Reilley. They had them in stock, the part numbers matched and cost about $6 each. I took in my original BMW NGKs and we took the part number off the OEM plug.
"That's right, you're not from Texas, but Texas wants you anyway." -LL
2001 Z3 3.0i Roadster (Topaz Blue Metallic, 5-speed manual, Sport Package, CD radio, heated seats and mirrors, non-power top via special order)
"Beemer" is for my BMW motorcycles - '13 K1300S, '95 R1100RS, '88 K75S, '75 R90S (gone, but not forgotten).