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Platinum Spark Plugs (archive)
[ Follow Ups ] [ 8-series (E31) Message Board ] [ Msg. Board FAQ ]
Posted by phil s on November 28, 1999 at 19:56:52:

While I was digging through my files to respond to another Board Member's question, I came across something that will be helpful to all you M-70 engine types out there. Changing spark plugs on our cars is a pain in the A**, so I decided to do some research a while back and do it just once (or not have to do it again for a VERY long time). The direct equivalent of the stock plug in platinum is NGK PZFR5F, stock number 7378. Now for the 840 and CSi crowd I would assume there would also be equivalents, but you'll have to call NGK (engineering) on that. You see all spark plugs share common characteristics such as thread size, reach, heat range, resistance etc. Although their (NGK's) cross reference did not list a replacement for the OEM BMW plug, by dissecting the OEM number, they were able to find a direct equivalent for me. When I changed them the engine actually seemed to run smoother, and the original plugs only had about 18k miles on them. Good luck!

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