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  #1  
Old 09-14-2010, 07:21 PM
cole3986 cole3986 is offline
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Default Replace Spark Plugs Every 30,000 Miles?

I just purchased 5.7 L crew cab Ram (this is the first mopar that I have purchased since I bought my 68 Cuda in 1987). The owners manual states that the spark plugs need to be replaced every 30,000 miles. Most new spark plugs do not have to replaced until 60,000 or even up to 100,000 miles. What is the story?- the only thing I replace spark plugs at this interval is my 68 cuda. This is service interval is very old school.
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Old 09-14-2010, 08:37 PM
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Yes , replace them every 30,000 miles unless you go with a exotic platinum , double platinum or iridium plug . I would recommend you stay with the standard ole fashion plugs . #1 Their cheaper . #2 If you leave plugs in for 60 or 100,000 miles there is a real good chance that with when you go to remove the plugs their gonna give you a fit coming out . You may pull the threads out of the head . And that stands for even a cast iron cylinder head . My Cadillac had 100,000 mile plugs in it . I replaced them at 57,000 because of a miss in the engine . I put in regular plugs .
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Old 09-14-2010, 08:52 PM
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the kicker is you are only replacing 8 of the 16 plugs at 30k. you get to do them all at 60 IIRC.
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Old 09-14-2010, 09:02 PM
keithh2oskier keithh2oskier is offline
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Is the 30k replacement only for the hemi? I have the 4.7 and I am still waiting on the owners manual to view the maintenance schedule. I have only had this truck two weeks so I haven't dove into the engine bay to really peer around yet.

Also does anyone know what the block and heads are made of on the 4.7? Are they both aluminum?

Finally what is the second row of spark plugs for? Is there any articles on the design of the motor and why it uses 16 over the conventional 8?

Thanks
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Old 09-14-2010, 09:10 PM
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If you know how to read or simply look at plugs as long as they arent burnt out and the gap is still within spec. then keep on keeping on! Just my opinion
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Old 09-14-2010, 09:16 PM
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Whats brands are compatible with these HEMI's
I would assume MOPAR/DODGE would cost a pretty penny
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Old 09-14-2010, 09:25 PM
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Quote:
Originally Posted by keithh2oskier View Post
Is the 30k replacement only for the hemi? I have the 4.7 and I am still waiting on the owners manual to view the maintenance schedule. I have only had this truck two weeks so I haven't dove into the engine bay to really peer around yet.

Also does anyone know what the block and heads are made of on the 4.7? Are they both aluminum?

Finally what is the second row of spark plugs for? Is there any articles on the design of the motor and why it uses 16 over the conventional 8?

Thanks
yes even the 4.7 every 30
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Old 09-14-2010, 09:31 PM
cole3986 cole3986 is offline
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The owners manual states to replace the inner spark plugs every 48,000 miles in the 4.7 L. engine and the outer plugs every 96,000. Oddly the manual does not state a separate service interval between the inner and outer spark plugs for the 5.7 L. Regarding spark plugs being frozen in the head if you wait to change them every 60,000 miles or longer- all you have to do is break them lose every 50K -with Platinum plugs they last a long long time- my 04 Tahoe has 100K plugs (they are jsut platinum) all I do is break them lose every 50 K or so- no problems-In my opinion using conventional plugs in a 2010 vehicle is totally inappropriate-are any other manufacturers that have a 30K service interval on their spark plugs? none of vehicles I own does.
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Old 09-14-2010, 09:41 PM
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Quote:
Originally Posted by cole3986 View Post
Oddly the manual does not state a separate service interval between the inner and outer spark plugs for the 5.7 L.
For some reason I kept thinking that I am supposed to change my plugs in the same manner as the 4.7L (but at 30k and 60k intervals). After reading your post I went back and reread the service manual section. Thanks for looking out.
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Old 09-14-2010, 09:48 PM
keithh2oskier keithh2oskier is offline
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Well the paper owners manual came today. So for the 4.7 it said for the uppers to be replaced at 48k and the ones on the side at 96. So that's not to bad. With these motors, it's such a PITA to change plugs, if I pull it out to read them then I might as well replace them.
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