14RAM1500BG
Senior Member
I see mopar shows part number SP143877AB. I see rock auto shows NGK 92145 LZFR5CI-11 Laser Iridium Spark Plug as being the same. Are they different or exactly the same plug for less dollars
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Ok, that was what I wondering if the parts store NGK plugs were the same quality or if they were a lesser quality. Since if is a bit of a chore to change plugs i wanted to make sure first.
You can push it past 100,000 on a stock or bolt-on truck with iridium plugs. My truck is a 2015
Save the $130 unless you have a 2013 or older that had copper plugs.
This is my first time dealing with iridium plugs. I had always believed in copper since I did lots of drag racing with the SRT4. Since I was always pushing that 4cyl I went through quite a few plugs.
For the Ram the iridium plugs either work or they don't. Even at 100,000 I don't think any of the 16 plugs lost gap.
View attachment 234461
They all measured with .043 - .044 which is acceptable room in error.
I would recommend saving the money on plugs unless of course you're running a nitrous or boost scenario.
I hear what your saying, i respect your experience and i dont mean sound like a **** but yea they still look good but the point of service intervals is to prevent failures before they start and $130 every 100k miles is completely acceptable in terms of prevention. IMO anyway.
I know Mainstream iridium intervals are crazy wide, between 60k-150k but not all vehicles are built the same
Well said I appreciate the opposition. I think your opinion versus mine should help readers make up there minds on changing out spark plugs.
As a test not that I would personally do it but I'd be curious to see how long 16 iridium plugs last till failure. The plugs I presented have 100,000 which to the experienced eye realizes you could still get more life out of them. Depending on how frugal you are of course.
For everyone seeing this thread and not sure, I have the Mopar box in my hand as I type this. It has BOTH SP14 3877 AB, *AND* LFZR5CI11 printed on it. They're the same damn thing. 1.5X the price for it to say MOPAR on it. I didn't pay for them, I found that box under the air cleaner when I bought it. The mechanic at the dealership must have been doing everything at once and dropped it in.I see mopar shows part number SP143877AB. I see rock auto shows NGK 92145 LZFR5CI-11 Laser Iridium Spark Plug as being the same. Are they different or exactly the same plug for less dollars
That spark plug came out of a cylinder that has turbulence. Are you dealing with a misfire or just maintenance replacing the plugs?You can push it past 100,000 on a stock or bolt-on truck with iridium plugs. My truck is a 2015
Save the $130 unless you have a 2013 or older that had copper plugs.
This is my first time dealing with iridium plugs. I had always believed in copper since I did lots of drag racing with the SRT4. Since I was always pushing that 4cyl I went through quite a few plugs.
For the Ram the iridium plugs either work or they don't. Even at 100,000 I don't think any of the 16 plugs lost gap.
View attachment 234461
They all measured with .043 - .044 which is acceptable room in error.
I would recommend saving the money on plugs unless of course you're running a nitrous or boost scenario.
Look at the porcellin close,you can see it has a weird burn pattern,the plugs have also lost the sharp edge on the ground strap,so they're done.The spark jumps from sharp edge to sharp edge,and once the ground strap loses it's sharp edge,you don't get a real good flame front,and it's also harder on the coils,as they have to build up a bigger charge to create the spark@Sherman Bird please elaborate.