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Old 11-13-2015, 11:12 PM
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Synthetic Oil help please

I have a 2003 Jeep Wrangler and thinking about putting synthetic in it, like Motul or Redline. The local Jeep place (Reno, NV), said that doing so would most likely cause a gasket leak around the rear main. I haven't seen this anywhere before and would like to get some thoughts. Another place that works on Jeeps wants to put in a Mobil 1 that is part conventional.

In addition, the manual calls for diff oils in my car 80W-90, the Jeep dealer said they suggest 75w-140, while the other place mentioned above called that lame and said stick with 80w-90. They are limited slip front and back.

thanks for the help.

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Old 11-14-2015, 07:50 AM   #2
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Synthetic oil will leak in situations where conventional oil will not, no doubt about that. By definition, Mobil 1 oil is synthetic. As far as I can tell, there is no Mobil 1 oil that is part conventional. (Note that "Mobil 1" and "Mobil" are not the same thing.)

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Old 11-14-2015, 07:59 AM   #3
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i run synthetic in my 2003 wrangler and i have no leaks.i call B.S.
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Old 11-14-2015, 08:24 AM   #4
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Older vehicles that had real rubber in the gaskets and seals used to develop oil leaks, as the Dino oils over time swelled the seals. If you switched to synthetic they would shrink and leak. Modern seals are mostly silicone now a days so not an issue. Even most older vehicles it's not an issue, because as things have been repaired and replaced so did the old seals.
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Old 11-14-2015, 09:15 AM   #5
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There really is no reason to switch over, especially with these old school motors. Stay with Dino oil, use a quality filter & change it every 5k. Save yourself money
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Old 11-14-2015, 10:02 AM   #6
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Mobil 1. Change it yourself and listen to how much more quietly your engine runs afterwords. Night and day.
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Old 11-14-2015, 12:01 PM   #7
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Regular Dino oil or a high mileage blend if needed. Really just making sure it's done regularly is most important.
Just as, or more important is a good filter. Wix is supposed to be very good quality.
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Old 11-14-2015, 01:10 PM   #8
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Mobil 1. Change it yourself and listen to how much more quietly your engine runs afterwords. Night and day.
In my personal opinion, that's a great example of the placebo effect in action.
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Old 11-14-2015, 01:40 PM   #9
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In my personal opinion, that's a great example of the placebo effect in action.

Have you done it? You cast your opinion remarkably far and frequently. you should have at least done it yourself by now.
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Old 11-14-2015, 01:49 PM   #10
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Synthetic vs Organic oils are always a hot topic on every vehicle forum I've ever been on. While most of the pros/cons come down to personal preference, opinion, conjecture, and application there is only one place where irrefutable facts are obtained:

Engine oil analysis.

I've used these guys for several years now on products ranging from a HD 1200cc twin to a 15k Cosworth engine. There are plenty of options out there though if you prefer something else.

http://m.blackstone-labs.com

With all of that said, I run Chevron supreme 10-30 from Costco (buy it when it's on sale 2-3 cases at a time) and change every 3k or so. In other toys it's AMSoil only. To each their own.
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Old 11-14-2015, 01:52 PM   #11
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If you were look in your owners manual, like I just did two days ago to see what viscosity gear oil to use in my diffs.,it says to use 80-90wt. in both front and rear, and to only use 70-140 in the rear diff. if you tow.
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Old 11-14-2015, 04:41 PM   #12
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Have you done it? You cast your opinion remarkably far and frequently. you should have at least done it yourself by now.
Yes, I have personally run Mobil-1 and it made zero difference in anything noticeable by me. I went back to Valvoline, no difference there either. Today's oils are so superb that you're not going to be able to hear a difference.
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Old 11-14-2015, 05:29 PM   #13
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its been proven time and time again syn is the better oil esp for four wheelers were more heat is a factor it does not break down and offers less resistance witch means more power .there is a ton of info out there not just jerrys info check for yourselfs.
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Old 11-14-2015, 05:30 PM   #14
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Yes, I have personally run Mobil-1 and it made zero difference in anything noticeable by me. I went back to Valvoline, no difference there either. Today's oils are so superb that you're not going to be able to hear a difference.
Well, empirical data!. That's a lot more interesting than your psychobabble. Why didn't you say so?
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Old 11-14-2015, 05:38 PM   #15
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Yes, I have personally run Mobil-1 and it made zero difference in anything noticeable by me. I went back to Valvoline, no difference there either. Today's oils are so superb that you're not going to be able to hear a difference.
^^^X2!!! I also tried Mobile 1 in my 4.0 engine and didn't notice any difference in the sound of my engine, verses Valvoline 10w30 conventional oil.

Now in my Pentastar 3.6 VVT engine, what does make a difference at start up, is the viscosity. That engine is quieter at start up with the 5w30, verses 5w20.
Several on the Forum have made this same comment.
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Old 11-14-2015, 08:44 PM   #16
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I bought my Jeep new in 05 and ran Mobile 1 until year before last. At 78,000 miles I developed a lifter tap. I switched to Quaker State Defy. The tap went away. I also had a slight RMS leak and that's gone as well. I still run Mobile 1 in my other vehicles but my Jeep is happier with the QS. Just my experience. ..
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Old 11-15-2015, 08:38 AM   #17
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I have a 2003 Jeep Wrangler and thinking about putting synthetic in it, like Motul or Redline. The local Jeep place (Reno, NV), said that doing so would most likely cause a gasket leak around the rear main. I haven't seen this anywhere before and would like to get some thoughts. Another place that works on Jeeps wants to put in a Mobil 1 that is part conventional.

You will never get a definite answer to this question. You'll get lots of free advice which is worth exactly what you pay for it along with everyone's opinion which is worth even less. As far as research goes, a researcher can make a study say anything he wants by tweaking a few variables. And sometimes manufacturers lie. Just ask the boys at Volkswagen.
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Old 11-15-2015, 10:13 AM   #18
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been running it in my jeep for years no leaks yet im not sure what to tell you mine is an 03 also.
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Old 11-15-2015, 10:26 AM   #19
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I bought my Jeep new in 05 and ran Mobile 1 until year before last. At 78,000 miles I developed a lifter tap. I switched to Quaker State Defy. The tap went away. I also had a slight RMS leak and that's gone as well. I still run Mobile 1 in my other vehicles but my Jeep is happier with the QS. Just my experience. ..
Hmm might have to try that. Been running moble 1 since day 1. Jeep now has 98k and has rear main leak and I can hear a tapping under the hood.
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Old 11-15-2015, 10:51 AM   #20
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I use Quaker State Defy. In doing some research a couple years ago I found a independent lab test of many different oils on the market. Quaker State Defy ranked #5 in the top 5 along with Amsoil, Redline, and Royal Purple. The one thing that all these oils had in common was boosted zinc levels and all were synthetics except for the Quaker state which was a blend. You can find the Defy on the shelf for at or around the same cost as conventional oils and for this reason and the fact it ranked #5 I run this in all my jeeps. I see no excessive leaks at all from any of my jeeps for using this Syn/blend not even my 1988 Wagoneer with 300k miles on her. Yes my 4.0's on my older jeeps leak a little oil but this is not the oil's fault. It is older gaskets and seals and just something I have come to live with having the tried and true 4.0 engines. On another note in that lab test Mobile1 and Castrol full synthetic ranked at #19 and #20 ranged to my surprise. This was again contributed to the zinc factor of which they have removed from their oils for what ever reason. Sorry for the long reply please forgive me for not having the link to this lab test but I believe it was on the Bob is the oil guy site.
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Old 11-15-2015, 12:52 PM   #21
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Now in my Pentastar 3.6 VVT engine, what does make a difference at start up, is the viscosity. That engine is quieter at start up with the 5w30, verses 5w20. Several on the Forum have made this same comment.
This is odd, cold starting the two oils (5w30 and 5w20) should be the same viscosity, it is only when at temperature that the 5w30 doesn't thin out as much (maintains a higher viscosity) as the 5w20 oil.
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Old 11-16-2015, 03:31 PM
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i run synthetic in my 2003 wrangler and i have no leaks.i call B.S.
Have you always had synthetic. The Jeep dealer said if you start new with synthetic then it's ok, but if you switch after time from conventional to synthetic that's where the problem comes in.
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Old 11-17-2015, 01:44 AM   #23
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Synthetics have additives to make them act like regular oil in the swelling of the seals aspect. Run what ever you want, synth is nice in the cold winters for starts and the high heat too...
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Old 11-17-2015, 02:10 AM   #24
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... The Jeep dealer said if you start new with synthetic then it's ok, but if you switch after time from conventional to synthetic that's where the problem comes in.
That's some serious baloney that dealer employee fed you.
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Old 12-17-2015, 01:48 PM   #25
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I've been using Amsoil full synthetic for several years and haven't developed a leak yet. The Wrangler Sport had its first change to full synthetic a couple weeks ago and everything on the bottom side is still bone dry.
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Old 12-17-2015, 02:25 PM   #26
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I've ran conventional, synthetic blend and full synthetic in my tj and have noticed zero difference between the oils. To that, I will be switching back to conventional and changing it every 5,00km.
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Old 12-17-2015, 04:04 PM   #27
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I've ran conventional, synthetic blend and full synthetic in my tj and have noticed zero difference between the oils. To that, I will be switching back to conventional and changing it every 5,00km.
What were you expecting to find difference in the oils?
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Old 12-17-2015, 04:09 PM   #28
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If you aren't leaking oil now you won't leak oil with synthetic oil. Synthetic oil doesn't cause leaks.
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Old 12-17-2015, 04:58 PM   #29
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Getting close to 18 months and 1,000 miles on Valvoline 10w-30. Have Mobil 1 5W-30 to replace, although the oil still looks good and no condensation under the oil cap.
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Old 12-17-2015, 07:07 PM   #30
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Getting close to 18 months and 1,000 miles on Valvoline 10w-30.
That's a VERY hard engine oil to beat. 50 years of running it with never an engine problem. I'd change that every 5k miles and continue running it... there's no benefit to paying more than what Valvoline (or Havoline, Castrol, etc.) costs.

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