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  #1  
Old 04-02-2014, 09:18 PM
roo roo is offline
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Default Original spark plugs

So I was wondering, how many miles have you put on your original plugs? I've got 49,000 and still running perfect.
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Old 04-02-2014, 10:42 PM
GrayhemiST GrayhemiST is offline
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Opinions vary on this subject.......some say 60K, I've heard 100K.......Most seem to go with 30K.......in my opinion 30K is ridiculous......with today's technology and platinum plugs, most engines don't need a plug change till 100K......and with 16 plugs to change @ $350 or higher....I'd wait till at least 60. unless your gas mileage goes down noticeably or you loose performance. JMO.
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Old 04-03-2014, 12:48 PM
huntergreen huntergreen is offline
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i am at 36000 miles on my original plugs. now that it is getting warm i will change them out myself.
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Old 04-03-2014, 01:12 PM
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GTyankee GTyankee is offline
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I changed my plugs the first time at 42,000 miles, they looked good, no rounded corners on the electrodes & they had good color

I changed them again at 50,000 plus miles, good color, but the electrodes showed wear

I used the OEM factory plugs both times in my '09 HEMI
NGK LZFR5C-11
Electrode Core Material: Copper
• Electrode Tip Material: Nickel

MOPAR SP-LZFR5C 11 is the same plug

Champion copper plus REC14MCC4 was also used back then

Best price that i found was at RockAuto, sub category Ignition
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Old 04-03-2014, 06:48 PM
GrayhemiST GrayhemiST is offline
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Thanks for the info GT......how hard is it to change them out? I'm used to working on small block Fords and Chevys
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Old 04-03-2014, 07:27 PM
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GTyankee GTyankee is offline
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I didn't change them myself, the back ones looked like they would be a bear to get to

If i had done it, i would have chopped up the rear part of the inner fenders & covered the cut out part with sort of a metal or composite flap & some kind of sheet metal QUICK OPERATING 1/4-TURN FASTENERS
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Old 04-03-2014, 09:17 PM
roo roo is offline
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Default

Thanks for all the info guys, 30,000 does seem premature to me also. Seems the Charger Police cars have a MOPAR SP-143877AA precious metal spark plug, $61.00 for 16 on ebay.

Last edited by roo; 04-03-2014 at 09:23 PM.
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Old 04-04-2014, 12:50 AM
smokn1500sport smokn1500sport is offline
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I can only speak from my own experience, that said my 2012 Sport CC's plugs were just about done in at 34,000. These stockers are copper plugs and are set to be swapped out ak 32k mile intervals (per the manual). There is no way the truck would have been any fun to drive if those plugs had been left any longer. I picked up the set through orielys'. The swap was nothing to involved and I had just under two hours into it. Picked up just over 3 mpg (hand calculated) after the swap.
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Old 04-04-2014, 11:11 AM
roo roo is offline
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3 mpg!
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Old 04-04-2014, 11:58 AM
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I changed mine this past weekend at 39k. They didn't look too bad and could've gone a lot longer but I bought the truck used so who knows how it was driven or taken care of regardless of its looks. Took just over 2 hours and yes the back ones were a stickler to get to. I'm not small, but pretty agile so I just sat on top of the motor to get the last 4. I'm sure there's an easier way to get these Take your time and have a few beers and it'll be worth the $350++ you'll save to do it yourself.

RockAuto already has great prices but here's another 5% off (exp 5/25/14 - unlimited use)
discount code: 2101538618877991
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