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Discussion Starter #1
I am planing on changing my spark plugs and wanted to know if anyone has had experience with the Bosch Platinum +4 Spark Plugs. The guy at a local parts store recomended them but didnt give any particular reason other than "these are the best" and they are 5.99 a plug. It seems like they just have four electrodes instead of the three like on the stock plug and are made out of platinum.
 

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If you search past postings in this forum (keywords: bosch plugs) you'll find the +4's aren't widely recommended - the general consensus is to stick with the original single electrode type - I read the originals are also platinum. Hope this helps.
 

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13 Challenger RT, 11 CTS Coupe Premium, 94 Eldorado (RIP)
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The bosch +4s are not good for you at all. Parts store guy gave me the same line years ago. I bought the +2s. I have since mailed them back to bosch and got my money back. They weren't worth the darn for me. The +4s are worse from what I have read. For the north*s, we use the dual platinum acdelcos. The center electrode and the ground electrode are both platinum.
 

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Mine came with the 3 prong electrodes also. I think those are the stock plugs. I had changed mine to the +4, but when I did that the car started running terribly. I then figured out that the previous owner must've never changed the wires and that the extra current was too much, so I put the stock plugs and new wires in and the car ran fine. So if you haven't changed your $200+ wires in a while I would do that before I put the +4 in.
 

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Discussion Starter #6
I just changed to the Bosch Platinum +4 Spark Plugs and have seen no difference so far. Nothing bad nothing good although I expect a few more miles to the gallon but still too early to tell. I did notice however oil in the plug wells not a lot but just enough to notice on the very top part of the threads of the plugs. The vehicele has 109,000 miles so i assume just worn piston rings but with this car it could be anything. Anyone else have this situation?
 

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13 Challenger RT, 11 CTS Coupe Premium, 94 Eldorado (RIP)
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I understand I have a different engine than you guys. But, for what it is worth, I had the +2s in for at least 15k miles. I thought they were fine at first. But then I started to experience problems. The main problem was one of the plugs acquired a crack in the ceramic shell. I decided to go back to the north*s oem delco plug. Going back to the delco after riding with the bosch's for a while allowed me to feel the difference immensely.
 

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the catera come with bosch 3 prong and changing them to the four prong is not that big of a difference
 

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The bosch +4s are the worst thing you can get if you look at the plug the four electrodes shoud the spark from the fuel-air mixture not good senses
 
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