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Old 02-27-2012, 08:14 AM
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V8 Spark Plug Maintenance Interval

For my 011' GC, Chrysler recommends changing the spark plugs at 36K mile intervals, while the V6 interval is 100K. Does anyone know why? I am up to almost 100K on the original plugs on my 04' 4.7 V8 with no issues.
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Old 02-27-2012, 08:44 AM
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Re: V8 Spark Plug Maintenance Interval

Your stock plugs are copper and you will definately notice improved performance after replacing them at 100K. Replace them with the stock Champions and you'll be happy you did

I'm assuming that the V6 utilizes a longer life plug. Hence, the extended replacement interval.
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Old 02-27-2012, 09:09 AM
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Re: V8 Spark Plug Maintenance Interval

Most newer engines use a platinum plug which will last longer. Also be careful on the 4.7, if they are in there too long you will not have fun trying to get them out without breaking them.
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Old 02-27-2012, 11:50 AM
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Re: V8 Spark Plug Maintenance Interval

Anyone know why the hemi uses a copper plug and not platinum?
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Old 02-27-2012, 02:48 PM
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Re: V8 Spark Plug Maintenance Interval

Cost
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Old 02-28-2012, 07:14 AM
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Re: V8 Spark Plug Maintenance Interval

It seems that it would be much cheaper to have platinum plugs because you have to change the copper plugs three times vs one time with platinum. There must be another reason.
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Old 02-28-2012, 07:51 AM
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Re: V8 Spark Plug Maintenance Interval

This topic was covered a month or so ago. Champion makes a 9055 Iridium plug to fit the 2011-12 HEMI. Intial cost is higher than copper, but the plugs have a 7 year, unlimited mile warranty. Change out the copper plugs at 36,000 for improved mileage and performance.
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Old 02-28-2012, 10:45 AM
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Re: V8 Spark Plug Maintenance Interval

Quote:
Originally Posted by peckmv View Post
It seems that it would be much cheaper to have platinum plugs because you have to change the copper plugs three times vs one time with platinum. There must be another reason.
Manufacturing cost, not ownership cost...
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Old 02-28-2012, 11:10 AM
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Re: V8 Spark Plug Maintenance Interval

the best spark plugs ar E3 Spark Plugs..IMO...I just got sponsored by them and installed my set of E3 and trust me you will notice a difference in milage and performance.
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Old 02-28-2012, 11:21 AM
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Re: V8 Spark Plug Maintenance Interval

Quote:
Originally Posted by nek121328 View Post
This topic was covered a month or so ago. Champion makes a 9055 Iridium plug to fit the 2011-12 HEMI. Intial cost is higher than copper, but the plugs have a 7 year, unlimited mile warranty. Change out the copper plugs at 36,000 for improved mileage and performance.
I also went to the NGK site and they spec a platinum plug along with the standard copper plug. The difference in cost is not much, so its a nobrainer. I was just wondering if for some reason the platinum couldn't be used in the hemi. The shocker for me is the cost of the diff fluid. Its like $40+ per quart. I heard its made by Castrol for Mopar. I plan on doing some more research to find a suitable replacement for the Mopar brand.
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Old 02-28-2012, 11:24 AM
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Re: V8 Spark Plug Maintenance Interval

Quote:
Originally Posted by bmrisko View Post
Manufacturing cost, not ownership cost...
Wow. A $40+k Jeep and they go the cheap on the spark plugs!
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Old 02-28-2012, 12:35 PM
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Re: V8 Spark Plug Maintenance Interval

Quote:
Originally Posted by peckmv View Post
I also went to the NGK site and they spec a platinum plug along with the standard copper plug. The difference in cost is not much, so its a nobrainer. I was just wondering if for some reason the platinum couldn't be used in the hemi. The shocker for me is the cost of the diff fluid. Its like $40+ per quart. I heard its made by Castrol for Mopar. I plan on doing some more research to find a suitable replacement for the Mopar brand.
Just read this post yesterday about gear lube. The PDF in the first post is interesting stuff, and if you trust it you don't even want to pay $4/quart for the Mopar fluid...

Interesting test on Gear Lube for Diffs
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