I have a bunch of spark plug questions and have searched all over but haven't been able to find the answer(s).
First, How often should one replace the spark plugs. I have a 98 and a 05 Taurus. The 98 has 88000 miles and I replace them about every 40k miles. The 05 goes about every 50k miles (I am not as attached to the 05 as I am with the 98) Does this sound ok?
Second why are the orig plugs that came with the vehicles different? The 05 taurus came with (3) AGSF22PM and (3) AGSF22PGM. The PGM's were hardly worn but the PM's needed replaced. Why? (non even wear)
Finally, I trusted the Napa store who sold me Autolite AP764's saying they were just fine for the 98 and put them in. Does anyone not like Autolites enough that makes me want to pay the high price Ford
wants for Motorcrafts?
Thanks in advance all!!!
p.s. I found the gap info I needed finally (It was .042-.046)