how often?
 

should the spark plugs and cables be replaced?
:shrug:

i dont have a 3.0, but i just changed my plugs / wires at 56k

ok cool, the guy i bought it from said he redid the plugs at 89k

im at 99k now

so im good

i think every 50k is good

i do mine once a year(maybe twice a year) regardless. plugs and wires

Are you crazy? How many miles do you drive a year? You shouldn't need to do it more often than every 3 or so. And that's just plugs...the wires shouldn't need replaced very often.

i did plugs at like 45k
will do wires with it next time. prob round like 65k or so