Thanks for your thoughts, gentlemen.

@LRJ4x4 - I agree with you that sticking with the factory spec plug is generally the way to go.

@JohnnyBfromPeoria - Thanks for sharing your experience with the IX plugs.

After further research on forum it seems the consensus is to go with iridium plugs for their longevity as it is a fair bit of work to get to the plugs.

Unless someone shares their poor experience with the IX iridium NGK spark plugs, I will go with JohnnyBfromPeoria's personal experience and put them in my Monty.

Thanks again,

Clem

1999 Mitsubishi Montero (Winter Package)