Bosch Platinum +4 Spark Plugs
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Cadillac Catera and Cimarron Forum Discussion, Bosch Platinum +4 Spark Plugs in Past Cadillac Vehicle Discussion; I am planing on changing my spark plugs and wanted to know if anyone has had experience with the Bosch ...
  1. #1
    meyema03's Avatar
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    Bosch Platinum +4 Spark Plugs

    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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    TomCat is offline Cadillac Owners Member
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    Re: Bosch Platinum +4 Spark Plugs

    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.

  4. #3
    Eldyfig's Avatar
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    Re: Bosch Platinum +4 Spark Plugs

    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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    miahcornell's Avatar
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    Re: Bosch Platinum +4 Spark Plugs

    My car came stock with 3 electrode plugs. I have the +4's in my car with no problems, but i have heard some stories....

  7. #5
    NJ_Catera is offline Cadillac Owners Fanatic
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    Re: Bosch Platinum +4 Spark Plugs

    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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    meyema03's Avatar
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    Re: Bosch Platinum +4 Spark Plugs

    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?

  9. #7
    cat
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    Re: Bosch Platinum +4 Spark Plugs

    Mine had the three prong plugs and just put in the four promg plugs and runs great

  10. #8
    Eldyfig's Avatar
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    Re: Bosch Platinum +4 Spark Plugs

    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.

  11. #9
    cat
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    Re: Bosch Platinum +4 Spark Plugs

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

  12. #10
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    Re: Bosch Platinum +4 Spark Plugs

    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

  13. #11
    cat
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    Re: Bosch Platinum +4 Spark Plugs

    what are you saying

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    Re: Bosch Platinum +4 Spark Plugs

    The ground electrodes shroud the spark from the air/fuel mixture, not very efficient. Looks cool though.

  15. #13
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    Re: Bosch Platinum +4 Spark Plugs

    those 4+ work fine for me

  16. #14
    Warez is offline Cadillac Owners Fanatic
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    Re: Bosch Platinum +4 Spark Plugs

    Cosidering that the factory plugs are Bosche +3, I can't imagine how +4 would be a problem.

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