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Change oil from non synth to synthetic

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Old 09-11-2013, 03:57 PM
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Originally Posted by TRAUMAhead
Does your JK burn any oil?

I'm at 75k, and burn about a quart every 1k-1.5k miles. Been using Dino 5w20 since the beginning, swapped the PCV valve around 70k, didn't help. I was thinking of switching to synthetic, but paranoid that if I switch the detergents will clean any gunk that might be slowing/stopping the oil burning.
Thanks for all the responses and I wish I could answer each one! She doesn't burn oil and I have the 3.8! I replaced the PVC valve at 30 when it says to check it because it was cheap and easy! I need to look at maintenance for 90k since I have 88810 when I pulled in the drive way tonight!
Old 09-11-2013, 05:28 PM
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oil change intervals depend on filter you use, if the filter is designed for synthetic oil you can go 6,000+ if not do not exceed 6,000

you can change back to regular oil at any time the " you have to stick with syn after you change" is a myth according to Moblie 1's website & others I've researched in the past, I had a Jeep Liberty & switched back & forth every other to 3rd oil change ( since new in 04) & never had a problem, did it to just run some good stuff in it once & awhile went 120,000 ( then traded) with out an issue, mostly HWY with trail rides in the mix once a month & ALOT of long trips, dealer even told me it would be fine & they were right

believe what you want, just telling you my experience & what I've read not tryin to start a war here
Old 09-11-2013, 09:36 PM
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Originally Posted by Pete1971
oil change intervals depend on filter you use, if the filter is designed for synthetic oil you can go 6,000+ if not do not exceed 6,000

you can change back to regular oil at any time the " you have to stick with syn after you change" is a myth according to Moblie 1's website & others I've researched in the past, I had a Jeep Liberty & switched back & forth every other to 3rd oil change ( since new in 04) & never had a problem, did it to just run some good stuff in it once & awhile went 120,000 ( then traded) with out an issue, mostly HWY with trail rides in the mix once a month & ALOT of long trips, dealer even told me it would be fine & they were right

believe what you want, just telling you my experience & what I've read not tryin to start a war here
I know that switching back and forth between dino and synethetic isn't a problem, it's just that after you switch to synthetic, the detergents will clean up any of the gunk that was possibly stopping the oil burning/leaking, so when you switch back to dino, the damage is already done. If my 3.8 didn't use up any oil, I'd be up for it to switching to synthetic. Gonna try 5w30 next time around and go from there.
Old 09-12-2013, 03:42 AM
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Originally Posted by HiHoSilver
So my JKU has gone to the dealer for oil changes since day one. 5w20 is what is in it non synthetic. I want to change to synthetic.. I have 89000 miles on my 2010!

Can this happen?
I use full synthetic and change it between 3000 to 5000, 3000 most of the time. Got 3200 on my oil now and have an oil change sittin by my door ready to change.
Old 09-12-2013, 05:41 AM
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Well I did it! 6 quarts of 5w20 royal purple synthetic with royal purple filter... The filter says up to 12k miles but I'm thinking 5-6k!
Old 09-12-2013, 06:13 AM
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With full syn I go around 7-8 thousand. Just keep checking oil level and color.
Old 09-12-2013, 10:48 AM
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In reguards to oil burning I'm at 10,400 mi on my 3.6 and the oil level has been very stable with no loss noticed. 5k switch from dino to syn.
Old 09-12-2013, 11:21 AM
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What do you pay for Royal Purple? You can get a 5-quart jig of Mobil 1 Syn at Wally World for about $25.

And I usually go 5k-6k miles for change intervals. Used oil is fairly dark, but still fairly transparent, so it could probably go longer, but it's cheap insurance. Mine has gotten synthetic from day 1.
Old 09-12-2013, 11:47 AM
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I think its up to about 5000 with a synthetic blend and 7500 with full synthetic. The problem is most filters are only good for about 5-6000. I would stick to that. I usually switch out the oil between 5-6000
Old 09-12-2013, 11:54 AM
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I'm only going to go 5-6 and I get rp for about 6-7 a quart!


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