MANU

WHAT IS AN OEM PLUG


Original Equipment Spark Plugs

When you change your spark plugs, should you use the same brand and part number as the original, or a different brand?

Most professional technicians say they usually replace same with same, unless there is a reason to install a different brand of spark plug. If you use the same spark plug that the engine came equipped with from the factory, you should not have any problems with spark plug Fouling, misfiring , detonation or pre-ignition

When a vehicle manufacturer chooses a certain spark plug for an engine, the plug has to undergo extensive validation testing to make sure it does not run too cold and foul, or run too hot and cause detonation or Pre-ignition, or suffer misfiring due to electrode position or wear. Most original equipment spark plugs today are platinum or iridium and have a recommended replacement interval of 100,000 miles. So the validation testing is designed to simulate that kind of mileage before the plug receives its stamp or approval.

SPARK PLUG BRANDS

Years ago, most vehicle manufacturers used only one brand of spark plugs in their engines:

AC Delco in GM engines

Motorcraft or Autolite in Ford engines

Champion in Chrysler engines

Bosch in European makes

NGK or DENSO in Asian makes

In most cases the vehicle manufacturer either owned the spark plug supplier, or had a long historical relationship with that supplier. But globalization and competition has changed that once-cozy relationship. Today, you may find some GM or Ford engines factory-equipped with Bosch spark plugs, Mazda engines equipped with Motorcraft spark plugs, Chrysler engines equipped with NGK or DENSO spark plugs, and so on. Most late model Saturn engines use NGK spark plugs. Kia and Hyundai may come factory-equipped with either NGK or Champion spark plugs. Some vehicle manufacturers still rely on a single spark plug supplier, but most use a mix of suppliers, even for the same engine.

For example, a late-model Chrysler V6 may come factory equipped with a Champion spark plug, a NGK spark plug or a DENSO spark plug. All are “factory approved” for the application, so which plug is used on any given day may depend where the engine is assembled, which supplier shipped the vehicle manufacturer a container of spark plugs that day, and so on.

WHICH BRAND OF SPARK PLUG IS BEST FOR YOUR ENGINE?

Here is another fact some people have a hard time digesting: No one brand of spark plug is superior to any other brand. This does not mean any brand of spark plug will work in any engine. The heat range of a replacement spark plug (ANY brand) must be a close match with the original spark plug (ANY brand) for good ignition performance. The electrode configuration can be different as can the materials used to make the electrodes, but the electrode gap(s) must not be too wide or too narrow for the air/fuel mixture or firing voltage capabilities of the ignition system. The electrodes on the replacement spark plugs should also be capable of lasting at least as long as the original spark plugs.

The best advice we can offer is to use the same brand and type of replacement spark plug as the original spark plugs that came in your engine, unless you want to upgrade standard plugs to long life platinum or iridium spark plugs.

If the spark plugs have already been replaced at least once in your engine, and you are not sure they are the same brand as the original, or you don’t know what brand the original plugs were, ask an auto parts store employee to look up the plugs for you in their data base. Most list the original equipment spark plug along with any other brands the store carries that may also fit your engine.

If you want a certain brand of spark plug, but the spark plug manufacturer does not list one of their spark plugs for your engine, there is a reason why. Either they do not make a plug that fits your engine, or the plugs they have do not have the correct heat range or electrodes for your engine.

DO NOT try to match plugs by visual appearance. Two different brands of spark plugs that seem to be identical on the outside (same diameter and thread pitch, same type of electrodes, same length) may have differences inside that create a significant difference in heat range.

31 thoughts on “WHAT IS AN OEM PLUG”

  1. Very informative blog article.Much thanks again. Fantastic.

  2. I must say I read a great article with pleasure

    1. Avatar maxtaco1919 says:

      Good to know

  3. Avatar film izle says:

    I cannot thank you enough for the post.Really thank you! Will read on… Franklin Maggini

  4. I’ve been exploring for a little bit for any high-quality articles or blog posts on this sort of area . Exploring in Yahoo I at last stumbled upon this site. Reading this info So i’m happy to convey that I’ve an incredibly good uncanny feeling I discovered just what I needed. I most certainly will make sure to don’t forget this web site and give it a look regularly. Sadye Skeens

  5. This is one awesome article post. Keep writing. Eliz Ypina

    1. Avatar maxtaco1919 says:

      thank you , we will

  6. Avatar online izle says:

    Wow, marvelous weblog format! How long have you been blogging for? you made blogging glance easy. The full glance of your website is magnificent, as smartly as the content material! Santina Procaccini

  7. Avatar porno says:

    Pretty! This was an incredibly wonderful article. Many thanks for providing these details. Shani Natty Kevan

    1. Avatar maxtaco1919 says:

      thanks for the message

  8. Avatar porno says:

    You made some respectable points there. I looked on the web for the problem as well as found most people will support with your internet site. Edwina Kristoffer Colwin

    1. Avatar maxtaco1919 says:

      thank you

  9. Avatar erotik says:

    Hi there, this weekend is nice for me, because this point in time i am reading thyis grat educational pos here at my residence. Keri Skelly Julieta

    1. Avatar maxtaco1919 says:

      Thank you very much

  10. Avatar porno says:

    My spouse and I stumbled over here by a different web page and thought I might as well check things out. Carlin Gar Hannon

    1. Avatar maxtaco1919 says:

      thank you

  11. Avatar erotik says:

    Wonderful, what a website it is! This webpage presents valuable information to us, keep it up. Myrna Waylin Conrad

    1. Avatar maxtaco1919 says:

      Great
      thanks

  12. Your means of explaining everything in this article is in fact fastidious, all be able to effortlessly know it, Thanks a lot. Mirabel Tucky Nobile

    1. Avatar maxtaco1919 says:

      thanks

  13. Avatar erotik izle says:

    Way cool! Some very valid points! I appreciate you writing this post plus the rest of the site is very good. Myrta Branden Taggart

    1. Avatar maxtaco1919 says:

      We appreciate your comment
      thanks

  14. i love this terrific article

  15. Avatar film says:

    Thank you, I used Word Press. There are several free themes to choose from. Charissa Tull Lang

  16. Avatar film says:

    Since the admin of this web page is working, no doubt very soon it will be well-known, due to its feature contents. Lorraine Abba Lelah

  17. Avatar sikis izle says:

    Thanks for the purpose of giving such superb knowledge. Nicolle Garv ErvIn

    1. Avatar maxtaco1919 says:

      Welcome sir

  18. Avatar erotik izle says:

    I was reading some of your articles on this website and I think this website is real informative! Continue putting up. Cristionna Rafferty Lindsy

    1. Avatar maxtaco1919 says:

      Thanks very much

  19. Avatar porno says:

    If you want to use the photo it would also be good to check with the artist beforehand in case it is subject to copyright. Best wishes. Aaren Reggis Sela

  20. Avatar maxtaco1919 says:

    They are first time fit spark plugs

Leave a Reply

Your email address will not be published. Required fields are marked *