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post #1 of 13 (permalink) Old 03-09-2015, 06:05 PM Thread Starter
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What brand spark plug do you like?

I wanna change my spark plugs in my 08XK 3.7L. I was wondering what most people use or like(had best luck with). I did the search and got mixed answers and it was an older posts so was looking for a more up to date answers. I know that the XK can be sensative to non OME parts so I dont want to mess up my engine. I know it needs them because They havent been changed in a while and Im finding that the dealere I got them it through didnt do what they said they dis=d on inspecting the vehicle before the release to buyer. I just changed the air filter and it was soooooooo black and filled with those tree seeds I cleaned it out and put a new K&N in and made a huge difference lol. So now looking to do plugs. I f you do list a type would like to ask the specific part number as I would like to order them . I looked at NGK ones:
http://www.jegs.com/i/NGK-Spark-Plug...rentProductId=
but I am not sure there are different models and lengths
http://www.jegs.com/p/NGK-Spark-Plug...30899/10002/-1
so being somewhat mechanically illiterate (can change oil and filters never done plugs) I want to get the right parts.And the links I listed are examples I know I found cheaper elsewhere but was using it more for showing different measurements. Heres better price examples.
http://www.autozone.com/external-eng...mpid=PS:1:1:21
thanks


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post #2 of 13 (permalink) Old 03-09-2015, 06:14 PM
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ZFR6F-11G (NGK) is the OEM plug. I don't know so much about the 6, but with how picky the 4.7 and 5.7 are, I would suggest sticking to original equipment. There is nothing to be gained by different spark plugs other than maintenance intervals.

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post #3 of 13 (permalink) Old 03-09-2015, 07:05 PM
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I have been using Bosh Platinum 2 in my 4.7 for 70k miles with no problems.
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post #4 of 13 (permalink) Old 03-09-2015, 08:13 PM Thread Starter
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I am begining to think Chrysler made their vehicles to use mopar parts exclusively just to get you to buy thier expensive products lol, Instead of allowing you to choose the brand you want.


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post #5 of 13 (permalink) Old 03-09-2015, 08:31 PM
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I've had NGK (6441) ZFR6FIX-11 Iridium IX Spark Plug's for 10k miles. MPG improvement was significant, but I had OEM plugs with a gap waaay out of spec.

No issues with them.

I spent like $7 a plug maybe?

http://www.amazon.com/gp/product/B000COVMXI/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
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post #6 of 13 (permalink) Old 03-09-2015, 08:34 PM
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The copper champion plugs used in the 4.7 and 5.7 are available at any auto parts store and are some of the cheapest plugs around. Those NGKs are most likely standard stock at auto parts stores as well.

That said, I do think Chrysler vehicles use excessively proprietary fluids.

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post #7 of 13 (permalink) Old 03-09-2015, 10:45 PM
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I'm getting tired of replacing the OEM NGK V-Power spark plugs on our 3.7L every 30K miles.
At least when the air resonator box is removed, it gives me an opportunity to clean the dirty throttle body.

I do know the 3.7L and 4.7L are nearly identical in engine design.

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post #8 of 13 (permalink) Old 03-09-2015, 10:56 PM
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Im sorry, i posted earlier that autolite were the oem when in fact they are NGK. I'm also running the NGK iridium lX, not autolite. I've had them in since July 2010. will pull them spring to inspect and measure the gap. But honestly, the underpowered 3.7 with these plugs, CAI and synthetic oils isn't so lazy anymore.


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post #9 of 13 (permalink) Old 03-10-2015, 12:52 AM
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Federal Regs/Laws and Consumer Demand has resulted in vehicles with more and more advanced systems that push the edge of performance and engineering. Because of that, the demands on the fluid are higher than ever before. and the equipment will NOT survive using past fluids.

Chrysler is NOT the only manufacturer that specify newer, more specific, harder to find fluids.

Anti-Freeze is because of owners that never changed the anti-freeze in their vehicles and when they damaged the cooling system of their vehicles because of it, they blamed the manufacturers. That is why there is dozen new long life anti-freezes, when the old green is just fine, if people would just use it correctly.

Plugs, true, as long as you have the right type with the temp range, they should work just as fine. But people have experienced problems using anything but the specific OEM plug. Others have no problems at all.

You need to figure out the ignition scheme of your engine. Some engines that have the wasted spark system, usually have half the plugs on reverse current. If you reverse current on a spark plug, you reverse anode/cathode, on a single platinum plug, it will erode away even faster than a normal steel electrode plug. You need to use double platinum.


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post #10 of 13 (permalink) Old 03-10-2015, 07:53 AM Thread Starter
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So how would I find out what the temp plug I need or the ignition scheme? lol TY for the info..... and Mongo I agree with you on the fluids it just seems like they are making the vehicles more specific for everything so we can't take it to our normal mechanic if they arent trained on some of the ins and outs or quirks of the vehicle lol. I do feel proper maintenance will go a long way in max performance in vehicle without doing to many modifications. Simple stuff like synthetic oil change , oil and air filter changes(K&N), and proper air tire pressure , changing spark plugs or checking them every 30k. And I can do normal maintenance stuff but definitely cant do some of the mods or engine stuff but I was interested in trying to change the plugs if I can. Its why I was asking specific plugs. ...and ty for the many replies. I just wanna make sure I have the right plug. I understand the gaping Its just I saw there are some that are labeled different sides? Or did I read that wrong? As long as they are the right measurement and temp I should be fine. I also saw that certain plugs are a pain to change? Specifically the back ones? I have a feeling that these plugs are original and I worry that they will be tough to get out. My XK has 59500 miles on it for 08 so.......seeing that the air filter was never touched I'm pretty sure plugs haven't been. Seems like little care was done on this XK other than basic oil change according the to carfax report when I bought it.


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Last edited by FletchXK; 03-10-2015 at 08:42 AM.
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