The old ones did look a bit on the white side, don't know which way is hotter on ... NGK BPR5ES, never had a problem with that type of plug. i run BPR4ES in oil ...
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difference-between-ngk-bpr5es-and-bpr4es
924/931/944/951/968 Forum - Spark Plug Question - What is the difference between NGK BPR7ES and the NGK BPR6ES? Called a shop and ... 939c2ea5af
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