Had my plugs changed and the Mechanic installed SP-507 PZT14F instead of the SP-462 PZT1F plugs. He said that he could not guarantee the truck would not mis-fire with the 462's. Anyone hear anything about this? Are the 507's the best choice for a 2004 3v? Note: 90K on original plugs, only one broke and he didn't charge me any extra. Old plugs looked like they could go another 100K.

 

Yep, he did you right. The 507's are 1 heat range hotter and don't carbon up so bad, and are the current factory recommendation.