I have a 1998 4.6 F150. The original plugs were Motorcraft Plats AWSF 32 PP

I went to the store and the counter guy sold me Motorcrsft AGSF 42 FM

Is this the right plug? Looks the same except it is fine wire plug and has threads all the way up to the sholder of the plug. The counter guy told me it is a higher heat range which is good for high milage engines, I have 170,000 miles with one plug change done already and this engine does not burn oil.

Please advise

Thanks

 

So after research, I find that this plug is the newer verson of the old plug, but one heat range higher. Will this plug do damage to my high milage engine? It does not burn oil.

What doe a higher heat range mean. Is it just the spark is hotter?