GC 3.6 V6 2016 spark plugs replacement. - JeepForum.com
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post #1 of 14 Old 04-06-2020, 09:12 PM Thread Starter
rebiobike77
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GC 3.6 V6 2016 spark plugs replacement.

Hi there guys, well most of the time on my previous cars/suvs i normally replace the spark plugs before what it says on the manual. My GC has aprox 56,000 miles and i have already replace 2 coils, coolant and i use pennzoil platinum 0W20 oil every 6500 miles. So i wonder if i should consider the spark plugs.

Thanks in advance.

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post #2 of 14 Old 04-06-2020, 09:59 PM
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Changing V6 spark plugs is a big job, I think there is a write up in the maintenance sticky thread. No reason to change them for routine maintenance before their 100,000 mile due date.

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post #3 of 14 Old 04-07-2020, 11:08 AM Thread Starter
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Thanks for your fast reply, yes i saw the video on you tube about it. I guess i will wait then, the same with my transmission fluid which says on my manual to change it @60,000 miles, dont know why is different than US.
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post #4 of 14 Old 04-07-2020, 11:25 AM
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60,000 miles may be for severe duty, like using your Jeep for police, taxi, fleet, offroad or frequent trailer towing. Otherwise the transmission fluid doesn't need to be changed. It may be a prudent thing to do around 120,000 miles, however. Exports could be different.

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post #5 of 14 Old 04-07-2020, 11:33 AM
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Using the correct oil is really important for the V6 because it has complicated VVT that needs perfect lubrication. Have you checked your filler cap? mine (2012) says 5W30 and not 5W20. If you plan on keeping the car for a while its worth spending the extra dollars and using fully synthetic oil. For some reason that I don't understand the US oil change interval is 5,000 miles when the exact same cars in Europe have a 12,000 mile oil change recommendation. Maybe its down to lobbying by the oil companies? I am old school, if the oil is clean when I change it I am good, if it dirty you need to change it sooner.

Regarding your spark plugs, the maintenance schedule says 100K Miles I changed mine at 110K and the gap was much bigger than .44 but there was still some electrode left and they could have worked for at least another 10K. Changing the plugs on the V6 is not easy so I would hold off unless you know you have plug related problems. Unless you are really good with tools you may want to consider getting this done by a professional mechanic.
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post #6 of 14 Old 04-07-2020, 12:46 PM Thread Starter
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Originally Posted by Bilko View Post
Using the correct oil is really important for the V6 because it has complicated VVT that needs perfect lubrication. Have you checked your filler cap? mine (2012) says 5W30 and not 5W20. If you plan on keeping the car for a while its worth spending the extra dollars and using fully synthetic oil. For some reason that I don't understand the US oil change interval is 5,000 miles when the exact same cars in Europe have a 12,000 mile oil change recommendation. Maybe its down to lobbying by the oil companies? I am old school, if the oil is clean when I change it I am good, if it dirty you need to change it sooner.

Regarding your spark plugs, the maintenance schedule says 100K Miles I changed mine at 110K and the gap was much bigger than .44 but there was still some electrode left and they could have worked for at least another 10K. Changing the plugs on the V6 is not easy so I would hold off unless you know you have plug related problems. Unless you are really good with tools you may want to consider getting this done by a professional mechanic.
Thanks my friend, at least know i dont have kind of problems on my GC. I use pennzoil platinum 0W20 synthetic. My car runs fine, a bit of lugging sometimes due low rpms/gear but nothing to worry about.
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post #7 of 14 Old 04-07-2020, 02:53 PM
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The North American oil change interval for 2016 V6s is whenever the oil change indicator says its time but should not exceed 10,000 miles (16,000 km), twelve months or 350 hours of engine run time, whichever comes first. Severe duty is 4000 miles (6500 km). The oil change indicator usually lights up between 8000 and 12000 miles, unless you spend a lot of time idling or in cold weather stop and go traffic. For 2016 use API Certified SAE 0W-20 Engine Oil, meeting the requirements of FCA Material Standard MS-6395 such as MOPAR, Pennzoil, and Shell Helix. Refer to the engine oil filler cap for correct SAE grade.

Other model years have different recommendations.

EU mandates vehicle to be designed for extended oil changes, at least 10000 miles I think, to reduce pollution.

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post #8 of 14 Old 04-07-2020, 04:42 PM Thread Starter
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great info!! thanks ColdCase, i normally do every 6500 miles aprox. normally 30% on the oil indicator if im correct.
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post #9 of 14 Old 04-07-2020, 06:24 PM
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Quote:
Originally Posted by rebiobike77 View Post
Thanks my friend, at least know i dont have kind of problems on my GC. I use pennzoil platinum 0W20 synthetic. My car runs fine, a bit of lugging sometimes due low rpms/gear but nothing to worry about.
You should be using the correct oil that is required by the manufacturer. You aren't doing your car any favors by using the wrong oil.
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post #10 of 14 Old 04-07-2020, 11:21 PM Thread Starter
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You should be using the correct oil that is required by the manufacturer. You aren't doing your car any favors by using the wrong oil.
The one im using is the one required by manufacturer 0w20, mine is 2016
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post #11 of 14 Old 04-08-2020, 08:19 AM
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Just check the owners manual or users guide, as exports are sometimes different.

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Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #12 of 14 Old 04-08-2020, 09:14 AM
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You can check the spark plugs on the easy side (condition, gaps) too get an idea how the tough side spark plugs look like.
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post #13 of 14 Old 04-08-2020, 10:56 PM Thread Starter
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Just check the owners manual or users guide, as exports are sometimes different.
Yes, it says 0w20
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post #14 of 14 Old 04-08-2020, 10:56 PM Thread Starter
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Originally Posted by BigTizzie View Post
You can check the spark plugs on the easy side (condition, gaps) too get an idea how the tough side spark plugs look like.
That's a good idea.
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