The Best Spark Plugs in the World and Why

  • Published: 07 January 2019
  • Spark plugs. The Best Spark Plugs in the World and Why, DIY and car repair with Scotty Kilmer. How spark plugs work. Copper spark plugs vs platinum spark plugs vs iridium spark plugs, which is better? What are the best spark plugs to buy? Best spark plugs for performance and horsepower. Spark plugs replacement. Buying spark plugs. Why spark plugs fail. Car advice. DIY car repair with Scotty Kilmer, an auto mechanic for the last 51 years.

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    Mechanic Monday Official Rules:
    1. The Mechanic Monday Giveaway will begin January 7th at 9 am CST and run for six days, ending on Jan 13th at 9 am CST.
    2. There will be one winner of set of spark plugs valued at $30.
    3. To enter, simply leave one non-offensive comment in the video below.
    4. Only one comment per entrant is allowed and more than one comment will not increase your odds of winning.
    5. Must be 18 years or old at the time of entering this giveaway OR have your parents’ permission.
    6. This giveaway is open worldwide.
    7. Any offensive, obscene, or lewd comments will be ineligible to win the giveaway.
    8. The odds of winning are based on how many people enter the giveaway.
    9. The winner will be chosen at random.
    10. The winner will receive a reply to their originally posted comment in the video and will also be announced in a newly posted comment by Scotty around Sunday 9 am CST. The winner will be required to respond to Scotty’s comment within 24 hours or their win will become void and a new winner will be chosen at random.
    11. The winner will be required to give Scotty their full name and mailing address to receive the prize.
    12. Entrants that use computers, programs, or any other means of cheating by adding additional comments through more than one account, will be ineligible to win the giveaway.
    13. Standard mailing time from the win date and the date received, will depend on the winner’s geographic location.
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    ⬇️Scotty’s Top DIY Tools:
    1. Bluetooth Scan Tool:
    2. Cheap Scan Tool:
    3. Professional Socket Set:
    4. Wrench Set:
    5. No Charging Required Car Jump Starter:
    6. Battery Pack Car Jump Starter:

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Comments • 9 963

  • Bryan
    Bryan  9 months back

    Great video Scotty! I used to work at autozone and half the time my coworkers had no clue about spark plugs so they would just recommend the most expensive ones and then customers come back pissed off finding out their cars run worse than their used set of plugs😅😅

    • Al Grayson
      Al Grayson  1 days back

      @Steve H. - Why are you addressing this to me?

    • Chuck Hallowell
      Chuck Hallowell  5 days back

      @Steve H. MOST of the time, it's best to stick with the OEM plug -- BUT -- in many cases, the OEM plug's features have been replaced by more modern technology.
      For example: The OEM plugs for the 95 MERC restoration were Single-platinum plugs from the factory.. A notation in the Factory Shop Manual says that the OEM plugs MUST be replaced with the Double-platinum type. A mechanic replaced the plugs with the OEM plugs, and they crapped out at only 40,000 miles.
      After doing A LOT of research, I chose the plugs at 2:17 of the video. Bosch Double-Iridiums give excellent performance and fuel economy for the 4.6 Liter V-8 under all conditions.

    • Chuck Hallowell
      Chuck Hallowell  5 days back

      @Karl Hopkins The BRAND of the spark plug is not very important -- it's the HEAT RANGE and the FIRING TIP design features that are most important.
      As the video shows at 2:17, the most advanced plug that's currently available is the Bosch Double-Iridium.

    • Kwesi Lynch
      Kwesi Lynch  1 weeks back


    • lady charlotte
      lady charlotte  1 weeks back

      For the ladies, can you recommend a brand ? I have a 97 honda accord. Thx !

  • Mr. Magaña
    Mr. Magaña  3 hours back

    Who's running ruthenium plugs?

    • Jaime Aguilar
      Jaime Aguilar  4 hours back

      I LOVE your vídeos is so helpfull

      • dvs1145
        dvs1145  6 hours back

        The bean counters are largely responsible for the difficulty encountered when making repairs on modern cars. Making cars difficult for the owner to repair makes work for the auto dealerships is another reason.

        • Yadira Martinez
          Yadira Martinez  13 hours back

          Hey Mr. Scotty, im using copper spark plugs for my Lancer ES. So there is no other advantage of using platinum spark plugs other than the durability? (lets say for example, less carbon deposits from combustion?) Thanks! im a big fan.

          • Alamdar Naqvi
            Alamdar Naqvi  16 hours back


            • Jaymes Holmes
              Jaymes Holmes  22 hours back

              Scotty you talked about heat range and even said some get hotter than others, but didn’t mention side gapping copper plugs. I am very disappointed because magically iridium and platinum are very low conductors of energy. I want the non magical ones because i care about performance. Because in fact magically theres as big difference performance wise as there is longevity wise. Why would I want one that lasts 200k miles but cause pre ignition? Why is it magically the side gapped copper ones all the sudden don’t magically not conduct energy like platinums and iridium?


              • TheKrisu091
                TheKrisu091  22 hours back

                Scotty what about Rhodium ones?

                • Bass Recon
                  Bass Recon  23 hours back

                  Is there a brand of spark plugs you’d recommend for a Toyota echo

                  • Gewgulkan Suhckitt
                    Gewgulkan Suhckitt  1 days back

                    I know a guy that used to work at K-Mart automotive. This is what he told me so I'm taking him at his word. This was maybe back in the 1980's. They had a standard price for changing spark plugs in a car regardless of make and model.

                    Apparently there was some car so poorly designed that in order to access the two spark plugs in the rear you actually had to at least partially remove the engine from the car. (This was the style of engine that was NOT turned sideways like most modern engines.)

                    Anyhow, after that happened at that location and possibly at some other locations as well with that same exact kind of car, K-Mart had to stop charging a standard price for changing spark plugs.

                    • Norm
                      Norm  1 days back

                      4:22 Ummmm thats not a 300ZX

                      • biggdeetx69
                        biggdeetx69  2 days back

                        What plugs do I use for my 200 Chevy Tahoe?

                      • Rikio Rikio
                        Rikio Rikio  2 days back

                        Back in The day, when i was a young mechanic...
                        Scotty’s grandchildren will be tired To listen to this, just To continue listening to that on youtube

                        • John Lieske
                          John Lieske  2 days back


                          • tom conner
                            tom conner  2 days back

                            I’m looking for a spark plug that functions as a gasoline direct cylinder fuel injector so I don’t end up ruining a good set of heads!

                            • robert mccully
                              robert mccully  3 days back

                              The best in the world, but follow what the manufacture put in.... whenever i hear the best in the world,,, oh well.

                              • fins59
                                fins59  3 days back

                                Why would I take advice from you Scotty, your garage and yard look like a junkyard.

                                • Thunder Chunky
                                  Thunder Chunky  3 days back

                                  Platinum is harder?! WTF are you talking about?

                                  • pooky pider
                                    pooky pider  3 days back

                                    Hey Scotty? Whats up with your eyes! Cant you look us in the eye???

                                    • Ogre302
                                      Ogre302  3 days back

                                      I put aftermarket heads and domed piston and the piston just tapped electrodes closed, I ended up having to use indexing shims.

                                      • Fredy Rosales
                                        Fredy Rosales  3 days back

                                        Is it too late to win the spark plugs? Could use some. Love the channel.

                                        • Musa Ismail
                                          Musa Ismail  3 days back

                                          Hello scotty, I am using lexus rx300 MCU15 1998, is it ok to use RX 350 spark plugs as the engine is similar but different cc ???

                                          • The Ultimate Male
                                            The Ultimate Male  3 days back

                                            BLOW UP YOUR ENGINES!!

                                            • DOUG BROWN
                                              DOUG BROWN  4 days back

                                              Thanks for the information Scotty.

                                              • DOUG BROWN
                                                DOUG BROWN  4 days back


                                                • Bump Of Death
                                                  Bump Of Death  4 days back

                                                  Scottie my teacher and a1 auto I learned more one guys so jelouses of him that's a mechanic he said scottie full of it .

                                                  • Don Boles
                                                    Don Boles  4 days back

                                                    Don't most new cars come standard with iridium plugs now?

                                                    • Justin Gonscak
                                                      Justin Gonscak  4 days back

                                                      Thanks for all your advice it is so helpful.I can't stop watching your vlogs .I'm from new Zealand do u need an apprentice lol you are my guru your knowledge is priceless thanks for sharing
                                                      JD. Invercargill,new Zealand

                                                      • Richard Johnson
                                                        Richard Johnson  4 days back

                                                        Great segment, very infomative; I have a 2005 300C w/small HEMI. I need to change the plugs (16 of them) and I want the longest lasting I can get, iridium!
                                                        Thanks, Scotty!

                                                        • Jose Gonzalez
                                                          Jose Gonzalez  4 days back

                                                          Hay there god bless you and yours thanks for the heads up on that one big one that is a big deal thanks again

                                                          • John Snyder
                                                            John Snyder  5 days back

                                                            Can you convince the auto industry to take their educated engineers to a auto repair shop and have them change parts? They will soon realize that AutoCad software doesn't always relate to repairing a vehicle easily. Even though I know the manufacturer wants you to trade your car in when it exceeds certain mileage rather than fix it. Other than that your videos are educational and explain how to fix something or what not to buy in the future. thanks.

                                                            • Nick Luxton
                                                              Nick Luxton  5 days back

                                                              📲*00212645752301* *whatapps*📲
                                                              شـبـاب🙋‍♂️ لاحــظــت كـثـيـر كـومـنـتـات عـن تــكــبــيــر الـقـضـيـب وضـعـف الانــتــصــاب وســرعــة الــقــذف
                                                              ولا يــهــمــك😉 تـواصـلـو مــع الـدكـتـور👨‍⚕️ الــلــي نــصــحــنــي بـوصـفـة اسـتـعـمـلـتـهـا كــم أسـبـوع وحـصـلـت عــلــى نــتــايــج مــذهــلــة🤩🥳
                                                              الـلـي عــايــز الــدكــتــور👨‍⚕️ يـتـواصـل مـعـه الـواتـسـاب *00212645752301*📲

                                                              • Kathy Lewis
                                                                Kathy Lewis  5 days back

                                                                Thanks so much for the video !!! Winner winner chicken dinner I have a 2005 PT Cruiser non turbo I need all the help I can get! Lol! Let me know when I win! Lol!

                                                                • Dave Schallick
                                                                  Dave Schallick  5 days back

                                                                  Hello I have a Ignition Coil question. Are aftermarket coils like a NKG brand as good as the stock ones?
                                                                  Thanks, love your videos

                                                                  • Dave Schallick
                                                                    Dave Schallick  3 days back

                                                                    @Chuck Hallowell
                                                                    Thanks Chuck, that pretty much answers my question....

                                                                  • Chuck Hallowell
                                                                    Chuck Hallowell  4 days back

                                                                    All "stock" coils are not "the same" -- All "aftermarket" coils are not "the same".
                                                                    I have run both stock and aftermarket coils in many types of vehicles under varying conditions.
                                                                    For Street-driven vehicles (non-racing), the stock (original equipment) coil will be the best choice, as it was designed for that particular vehicle.
                                                                    For the 95 MERC Restoration, the stock Ford coils were removed, cleaned, tested, and re-installed; still performing perfectly at 165,000 miles.
                                                                    For Racing and/or High-performance demands, the MSD brand has been the favorite of racers for decades. The ACCEL brand, not so much.

                                                                • Sir Jhonson
                                                                  Sir Jhonson  5 days back

                                                                  I always use Motor Craft in Ford / Murk , AC Delco in GM , Champion in Dodge and NGK in Jap cars.

                                                                  • Nidaa vlogs
                                                                    Nidaa vlogs  6 days back

                                                                    Do spark plugs effect gas mileage thx

                                                                    • Keoni Ka'auwau'ole
                                                                      Keoni Ka'auwau'ole  6 days back

                                                                      Love your channel.Helped me out a lot in some situations..thank you.

                                                                      • mad ass
                                                                        mad ass  6 days back

                                                                        There's plenty good cross reference charts. Never had iridium foul in a two stroke.

                                                                        • Sean Mets
                                                                          Sean Mets  6 days back

                                                                          Mine requires iridium

                                                                          • nonoyo beezewax
                                                                            nonoyo beezewax  6 days back

                                                                            Hey Scotty, or anyone else who would be able to answer this...My car is almost 10 years old and it runs fine. Even though my car only has 42K miles on it, should consider changing the plugs becuase they're nearly 10 years old?

                                                                          • Steven Wells
                                                                            Steven Wells  6 days back

                                                                            Fantastic story about spark plugs absolutely makes sense thanks Scotty

                                                                            • Geronimo exotic Soles Adventure.

                                                                              Why does he remind me of the actor Christopher Lloyd from the back to the 🔮 future movie.... 😊

                                                                              • Chuck Hallowell
                                                                                Chuck Hallowell  4 days back

                                                                                I don't know. Why DOES he remind you of Christopher Lloyd ??
                                                                                Scotty reminds me of an old guy on U-Tube that makes a lot of videos and talks with his hands.
                                                                                Scotty probably knows a lot more about cars than Christopher Lloyd.

                                                                            • George Boston
                                                                              George Boston  1 weeks back

                                                                              i think you use your head for something besides a hat rack Scotty keep it up the good work you are helpfull

                                                                              • William Iannucci
                                                                                William Iannucci  1 weeks back

                                                                                Your the best !!!

                                                                                • Joe Lee
                                                                                  Joe Lee  1 weeks back

                                                                                  Let me tell you one thing I was a mechanic for race cars built my own the best spark plug there is. IS Autolite. THE 2nd best spark plug is .A C . Those are the two best spark plugs in the world for cars.

                                                                                  • Brian Norton
                                                                                    Brian Norton  1 weeks back

                                                                                    Hey scotty. Love your advice, its always practical.

                                                                                    • Kevin Shannon
                                                                                      Kevin Shannon  1 weeks back

                                                                                      Scotty if taught mechanics I'd take your class

                                                                                      • Aji Setiawan
                                                                                        Aji Setiawan  1 weeks back

                                                                                        Yo this old man is so angry, I like him 😂