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Old 01-26-2014, 12:55 PM   #1
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synthetic oil ok?

My manual says to never go beyond 6,000 miles between oil changes. Mobil 1 synthetic guarantees 15,000 miles. Is this ok? Is the manual just dated (2003 wrangler). Any other older jeeps using synthetic oil? Thoughts? Thanks.

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Old 01-26-2014, 02:01 PM   #2
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[QUOTE="bshep06;7739873"]My manual says to never go beyond 6,000 miles between oil changes. Mobil 1 synthetic guarantees 15,000 miles. Is this ok? Is the manual just dated (2003 wrangler). Any other older jeeps using synthetic oil? Thoughts? Thanks.[/QUOTE

Id change it a 6k. Are you switching from dino to synthetic or have you been running synthetic all along?

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Old 01-26-2014, 02:35 PM   #3
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Thinking of switching to synthetic. Hoping to get pros and cons.
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Old 01-26-2014, 02:38 PM   #4
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Alot of times switching leads to oil leaks. The synthetic is much thinner and will seep out of the seals. For me its not worth the extra $$$
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Old 01-26-2014, 07:39 PM   #5
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Unless your jeep has low miles switching will do more harm than good. My opinion has always been that a consistent oil change is better than top self oil.
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Old 01-26-2014, 07:59 PM   #6
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I have ran synthetic Amsoil in the last 4 cars with a combined 400,000+ miles and no oil leaking from seals. In my 12 JK I change oil at 10,000 mile intervals and change the filter every 5,000 miles. I have done this with every vehicle I have owned with no problems. My JK has 31,000+ miles with no problem and I changed using Amsoil at 500 miles.
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Old 01-26-2014, 08:02 PM   #7
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Quote:
Originally Posted by Lando25 View Post
Unless your jeep has low miles switching will do more harm than good. My opinion has always been that a consistent oil change is better than top self oil.
Isn't 110,000 miles low miles on a jeep?
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Old 01-27-2014, 04:58 PM   #8
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In the 4.0, I would stay with a good quality 10w30 Conventional oil.
As prior stated, switching to synthetics on high mileage engines, has a tendency to cause oil leaks. When I owned my TJ 4.0, I used Valvoline 10w30.
Now in my new 2013 3.6, I switched over at 5000 miles to 5w20 synthetic.
So it's really just a matter of choice.
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Old 01-27-2014, 05:11 PM   #9
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Quote:
Originally Posted by bshep06 View Post

Isn't 110,000 miles low miles on a jeep?
Not necessarily, but switching could cause problems being that far off the break in period.
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Old 01-27-2014, 05:40 PM   #10
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I usually stay away from these repeated "oil type" threads, but I'll post on this one. My TJ is a 03 with 70, +++ miles. In Nov of 2013, (two months ago) I switched to Synthetic, and have NO leaks!

Granted it's early, but I think the info of "leaks" if switching to synthetics is outdated.
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Old 01-27-2014, 05:50 PM   #11
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Glad you commented this time
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Old 01-28-2014, 12:44 AM   #12
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I had a couple Lincolns, did it in a Bonneville, Escort etc I stayed or switched back and forth with synth and reg many times without issue.

I like to use the synth in the winter as I find vehicles start easier in the cold with it...
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Old 01-28-2014, 12:58 AM   #13
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5 vehicles + a new backhoe-loader-tractor

all from new as soon as they got home the oil was drained & refilled with mobil 1 syn oil.
I just bought a 2014 wrangler 1-13-14 as soon as it rolled up to the garage I drained the crude out .
Syn don't boil till after 400f crude 220f & will not solidify in cold like crude .
All my lawn mowers ,tillers ,chippers exc. use only syn.
Just an ole timers thoughts . Biff
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Old 01-28-2014, 01:17 AM   #14
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Careful changing out the dino until the rings are seated. Need some scraping before u add the synthetic.
Viscosity is viscosity...synthetic is not thinner (at same viscosity anyway), it just lubes better, and doesn't break down under high temps like dino.
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Old 01-28-2014, 03:20 AM   #15
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Quote:
Originally Posted by Getnoff View Post
Careful changing out the dino until the rings are seated. Need some scraping before u add the synthetic.
Viscosity is viscosity...synthetic is not thinner (at same viscosity anyway), it just lubes better, and doesn't break down under high temps like dino.
Troy
Exactly. The whole thing about synthetic being thinner is a myth.

The main advantage is described above: it doesn't suffer from thermal breakdown as readily as petroleum based oil. It is a better lubricant but it can still get dirty. The 3K oil change is also a myth. The engine monitors the condition of the oil and notifies when it needs to be changed. It does not expect synthetic oil however. As long as you change your oil at reasonable intervals both will serve the purpose. You have to decide if the additional cost is worth it to you. Pick one and stay with it.

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