I just had replaced my bosch platinum +4 w/ new ones.
the old ones were in there for 5-6 yrs forget how long but they worked great and they are a coco brown so they are burning just rite

 

mine had about 40k on them when i took them out and they had a slight gray on the tip of the diode going to each arm. i know it feels like my truck lost a little pep when i took them out. my sisters truck has the bosch +4 iridium and it really likes them, i think i'm gonna switch to those eventually.

 

well here we go again the truck wouldn't start this morning and i was pissed all day wondering what it could be iac,tps, map,the new crank sensor ,the new cam sensor. the only things i didnt replace was the iac tps or the map sensors so i went and got them before coming home 209 beens pissed away but atleast they are new now. after the install truck stumbling allover it's self. so i make a call to a freind of mine up north that works for dodge and he said sounds like the cat is clogged up and that i didnt need to buy the sensors. so i cut the pipe and got out the drill and a spade hole saw for wood and went to town inside the cat. went to start it and the damn thing fired rite up idled great very responsive so after the clean out i welded up the pipe and now she runs great for now. will find out this weekend how she pulls

 

Keep the old sensors for spares, never know when you will need them.