Spark plugs
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Thread: Spark plugs

  1. #1
    Junior Soul Tape's Avatar
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    Spark plugs

    What kind of spark plugs are most of the Soul owners buying?
    Are you getting the Iridium Spark Plug? Can the Soul 2.0 run on the coppers or must they use the Iridium Plug or equivalent?
    I searched here and cannot get a definite answer either way.

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  3. #2
    Intermediate Soul GeekOnTheHill's Avatar
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    The Champion Copper Plus 445 (RER8MC) comes up on a few compatibility lists, but you'd have to open the gap slightly. They come at .040 and you want .044.

    I'm actually a fan of at least trying copper plugs on cars where they're easy to get to. Copper has better conductivity and sometimes yields improved MPG. But you do have to figure on changing them every year or two, and the performance improvements are not guaranteed.

    I used to collect Saturns, and copper plugs always improved MPG by 10 to 20 percent over platinum or iridium (which the engines were not designed for) on the older Saturn engines. One of the first things I did upon buying a used Saturn would be to change the plugs back to copper from whatever the last mechanic installed. MPG improvements were practically guaranteed due to the peculiarities of that engine's ignition system.

    On most other cars, the improvements using copper have been less spectacular and usually not worth the increased change interval. I've never tried them in the Soul. I probably should because there are only four of them and they're easy to get to. It might pick up a MPG or two, and the downside is pretty insignificant. They're like $2.00 per plug.
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    Richard

  4. #3
    Elder Soul The Sradiator's Avatar
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    NGK, Denso, AC.
    I refuse to use champion in anything but my lawn mower these days.
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  5. #4
    Intermediate Soul
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    I too prefer to convert mine to copper plugs because as Richard said, they tend to offer better performance, but do require more maintenance. The benefit of having to change your plugs more often is avoiding plugs that are "welded" in place after years of use (making them near-impossible to remove; I've only broken off one plug so far and wish to avoid that again). The real advantage to iridium or other long-lasting plugs is when your engine is shoe-horned in to the point that accessing some plugs is near-impossible. Transverse 6-cylinders often make accessing the rear plugs a nightmare (hence why some shops charge $500 to replace those). Copper plugs. Gap 'em, add anti-seize compound, and check proper torque twice when installing. Every 12 - 24,000 miles, repeat.
    Greg
    Last edited by grege; 06-22-2015 at 01:27 PM.
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  6. #5
    Intermediate Soul GeekOnTheHill's Avatar
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    Quote Originally Posted by The Sradiator View Post
    NGK, Denso, AC.
    I refuse to use champion in anything but my lawn mower these days.
    I usually prefer any of the companies you mentioned, as well; so I haven't used Champions for a while except in power equipment, either. But I had no special hate for them. Have they gone downhill?
    Richard

  7. #6
    Junior Soul Tape's Avatar
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    Quote Originally Posted by The Sradiator View Post
    NGK, Denso, AC.
    I refuse to use champion in anything but my lawn mower these days.
    NGK is my preference, that is what I run in my Mustang and it gets great mileage, 19/27 almost as well as my Soul which is a downer. When I bought the Soul I thought 35-39 would be the norm but that is what I get for wishful thinking. I am getting about 27-8 in the city so I plan on taking a trip to the casino's in Mississippi and it will be a disappointment if I cannot make it there and back on a tank full (406 miles roundtrip). I am an air conditioner freakazoid during the summer so I may see better numbers in the fall/winter but not wishful thinking again.

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    Junior Soul Tape's Avatar
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    So it is alright to use copper in the Soul yes? I was wondering because every time I search online they always show the Iridium plugs and not even show the coppers, they is referring too AutoZone and Advance auto. O'Reilly's did show coppers.

  9. #8
    Intermediate Soul GeekOnTheHill's Avatar
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    Quote Originally Posted by Tape View Post
    So it is alright to use copper in the Soul yes? I was wondering because every time I search online they always show the Iridium plugs and not even show the coppers, they is referring too AutoZone and Advance auto. O'Reilly's did show coppers.
    Yes, it is okay. You do have to use the correct copper plugs, of course.

    However, you'll have to change copper plugs more often, and you may or may not realize any improvement in MPG or performance. Some cars do, others don't. Generally speaking, it's been my experience that cars that were designed for the newer plugs don't get as much (if any) improvement with copper. They were designed to perform well with the newer metals.

    Iridium and platinum are popular mainly because they last much, much longer, and most people like that. In the long run, if you don't get any MPG improvement from copper, platinum or iridium wind up costing less.

    So if you want to give copper a try, your engine won't blow up. But you may or may not realize any improvement.
    Tape likes this.
    Richard

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