NGK Ruthenium Spark Plugs

[Mr Adventures]

This is more of a PSA: Figured I’d post my experience here with changing spark plugs. Tried out the NGK Ruthenium 95605. No matter what gap I put them at they cause serious misfire on all cylinders. Tried them at 0.031, 0.029, 0.028, 0.027. All give the same problem. Throw the stock plugs back in and she runs perfectly. Not sure where to go from here with the NGKs. Thinking I’m going to stick with Ford plugs.

FYI my plugs definitely need a change at 67k miles. They’ll probably be “fine” for another 5-10k miles but I’m not one to wait for something to fail. Don’t wait to check them at 100k miles like it says in the manual, check at least at 60k.

cheers

Sponsored

 

[Joeiconic]

If she runs perfectly, why do you need to change them?

 

[rydfree]

If she runs perfectly, why do you need to change them?

 

[deleriumtremor]

You have the wrong plug.

The right number for that plug is NGK 90495.

 

[Dgc333]

FWIW, the Ford plugs are rebranded NGKs.

 

[daniel3507]

I believe some Ford plugs are rebranded Denso as well. Also, you get longer life out of iridium plugs compared to ruthenium.

I feel like Ford has changed plug recommendations so much it's hard to keep up with what plugs you should run.

 

[Dgc333]

Also, you get longer life out of iridium plugs compared to ruthenium.

The marketing hype for the ruthenium plugs is that they last longer than iridium. All of the exotic metal plugs are for longevity not performance.

 

[Trigganometry]

The marketing hype for the ruthenium plugs is that they last longer than iridium. All of the exotic metal plugs are for longevity not performance.

This! Copper plugs give the hottest spark. Everything after that is cooler and longer lasting. Years ago if you looked hard enough you could find silver plugs. Those were awesome!

 

[Progeny2021]

This is more of a PSA: Figured I’d post my experience here with changing spark plugs. Tried out the NGK Ruthenium 95605. No matter what gap I put them at they cause serious misfire on all cylinders. Tried them at 0.031, 0.029, 0.028, 0.027. All give the same problem. Throw the stock plugs back in and she runs perfectly. Not sure where to go from here with the NGKs. Thinking I’m going to stick with Ford plugs.

FYI my plugs definitely need a change at 67k miles. They’ll probably be “fine” for another 5-10k miles but I’m not one to wait for something to fail. Don’t wait to check them at 100k miles like it says in the manual, check at least at 60k.

cheers

I tried stretching out the service interval on my ‘98 Mustang to the recommended 100k miles. Performance/fuel mileage noticeably degraded after 90k miles - new plugs corrected this. My current Chrysler has the 5.7L motor with 16 spark plugs. Chrysler recommends 100k miles? Owners state 60k miles is replacement time.

 

[daniel3507]

The marketing hype for the ruthenium plugs is that they last longer than iridium. All of the exotic metal plugs are for longevity not performance.

Interesting. I have always read that they don't last as long. Now that I look further into it, I'm seeing some places say they last longer and some places saying iridium lasts longer. Clear as mid.

 

[Bob902]

I tried stretching out the service interval on my ‘98 Mustang to the recommended 100k miles. Performance/fuel mileage noticeably degraded after 90k miles - new plugs corrected this. My current Chrysler has the 5.7L motor with 16 spark plugs. Chrysler recommends 100k miles? Owners state 60k miles is replacement time.

I replaced the plugs in our Durango Hemi at 100k. They looked like they could have lasted a little longer, although the mileage and performance went back up.

 

[halligan1201]

You have the wrong plug.

The right number for that plug is NGK 90495.

How did you find that number? The NGK website doesn't list a ruthenium plug for our truck and when I emailed them, they replied that they don't make a ruthenium recommended for our truck. I see the number OP listed on a site called OZTuning but that's it and clearly from his experience, they're the wrong plug.

 

[Dgc333]

A guy I used to work with had a Tundra that he just trashed. Anyway, he decided to change the original plugs at 175k miles. He couldn't get a couple of them out so he just left them in, that was about 5 years ago so I would guess those two plugs are well over 200k.

The side electrode on the ones he did remove were gone and the center electrode was worn flush with the ceramic. It was amazing that he said it ran fine and passed emissions without misfires.

 

[deleriumtremor]

How did you find that number? The NGK website doesn't list a ruthenium plug for our truck and when I emailed them, they replied that they don't make a ruthenium recommended for our truck. I see the number OP listed on a site called OZTuning but that's it and clearly from his experience, they're the wrong plug.

Both Rockauto and Autozone list 90495

 

[deleriumtremor]

How did you find that number? The NGK website doesn't list a ruthenium plug for our truck and when I emailed them, they replied that they don't make a ruthenium recommended for our truck. I see the number OP listed on a site called OZTuning but that's it and clearly from his experience, they're the wrong plug.

The good news it appears the ones the OP got were too short, versus too long...

Sponsored