![]() ![]() 040 is a good bit away from the Merc requirement of. ![]() 031 in 2005?Īnd - why does NGK say plugs can be used interchangeably as long as all are gapped at. So - why did Merc change from PZ gapped at (.040 NGK figure) (.043 Merc figure) to IZ gapped at. Because both plugs have identical dimensions besides the gap they can be used interchangeably without a problem, just be sure they are all gapped the same. So the 96-04 models use the platinum plug with the larger gap setting (.040?). (Here is the current up to date application listing for this engine: NGK, after conversation with them, revised their specs and sent me this info in an email: I may be beating a dead horse with all this discussion about spark plug difference but I'd sure like to understand why the slight discrepancies and why the change from one year to another. ![]()
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