My 06 f 250 6.8 has 43000 miles. Just wanted some good advice about when I should change them. Was thinking I would just change them now or should I wait untill the reccomended time per the service manual. Thanks. Any advice appreciiated.

 

Change them ASAP!! You have the first generation 3 valve 2 piece spark plugs. I would make sure you have the special tool to extract the broken part of the plug. There are some tricks some guys have used to extract them without breakage. Do a search on it.