Quote:
Originally Posted by Bucketlist
... At that time I found this crossover chart.....
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Here is a larger cross-brank heat reference
According to the above, Bosch 3's are equivalent to NGK 9's
According to the above, Bosch 4's are equivalent to NGK 8's
However the NGK cross ref shows some Bosch 3's equivalent to both NGK 8's and 9's.
Interestingly enough I just noticed the NGK cross reference lists the BP8ES as equivalent to Bosch W3DP0.