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Old 05-09-2011, 10:09 AM   #1
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My Jeeps using oil.... Not an oil debate

2500 miles ago I poured in 6qrts of full synthetic oil and slapped on a Mopar filter. Checked oil after changing it and level was sitting about 3/4 the way to the full mark. Checked my oil yesterday and it was at the add line... This is the first oil change using synthetic.. Is this common? Does anyone else have/had this problem? Should I switch back to regular oil? It has never done this before in 35k miles.

PS: I do not intend for this to be a debate on oil brands, filter brands, change intervals, or anything of that nature. Just need a little help.

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Old 05-09-2011, 03:33 PM   #2
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I changed the oil in my 2007 4dr/2wd Wrangler @ 5000 miles and was at the 3/4 full mark. I do not use synthetic oil.

Now I have a tap in the engine and am afraid that I may have spun a main bearing!!!

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Old 05-09-2011, 03:43 PM   #3
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I'd be curious to hear what others say, as I just bought my 06 TJ and am getting ready to do the oil change. I too will be putting full synthetic in it.
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Old 05-09-2011, 03:47 PM   #4
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There's a few threads on this. It's apparently a "quirk" ("defect"?) with the design of the engine. Here's an example of the threads.
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Old 05-09-2011, 04:05 PM   #5
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The only way you're going to be able to tell is if you go back to non-synthetic and see if you have the same result with your engine. Just be aware that there are a number of factors that lead to oil consumption; such as heat, atmospheric temperature, type of driving and viscosity of oil to name a few. I'm sure you're aware of the numerous threads on oil consumption in some 3.8's, not all. Not to debate it but I only use non-synthetic oil in this engine because it's not engineered to specifically run on synthetic like, for example, BMW's, Corvettes, and even Mini Coopers, etc. In those vehicles I only used synthetic. It's like using premium fuel in it. It's not made to run on it. It's actually more important to change it more often with this engine to get rid of contaminants then to extend the oil changes using synthetic. The tolerances just aren't there in the manufacturing process. The 3.8 is a good engine and will last but it will never be a performance engine which would require different types of maintenance. In order not to further debate it and help you I'll go back to change out the syn. and see what happens. It's only one oil change.
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Old 05-10-2011, 09:32 AM   #6
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Quote:
Originally Posted by kik View Post
The only way you're going to be able to tell is if you go back to non-synthetic and see if you have the same result with your engine. Just be aware that there are a number of factors that lead to oil consumption; such as heat, atmospheric temperature, type of driving and viscosity of oil to name a few. I'm sure you're aware of the numerous threads on oil consumption in some 3.8's, not all. Not to debate it but I only use non-synthetic oil in this engine because it's not engineered to specifically run on synthetic like, for example, BMW's, Corvettes, and even Mini Coopers, etc. In those vehicles I only used synthetic. It's like using premium fuel in it. It's not made to run on it. It's actually more important to change it more often with this engine to get rid of contaminants then to extend the oil changes using synthetic. The tolerances just aren't there in the manufacturing process. The 3.8 is a good engine and will last but it will never be a performance engine which would require different types of maintenance. In order not to further debate it and help you I'll go back to change out the syn. and see what happens. It's only one oil change.

I wasn't aware of the threads but I'll check em out thanks! I had heard that Chrysler puts synthetic in all the SRT models so I assumed it couldn't be a bad thing for my Jeep. So would it be a bad idea to switch back? or could this cause me more problems? If so should it be done immediately?
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Old 05-10-2011, 10:07 AM   #7
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It's not bad at all. I just don't think there really is that much of a benefit with this engine. Others will say different. You can switch back and forth as many times as you want, but it's just going to cost you in $. You don't have to change it immediately. However, if you're curious to see if you don't seem to burn oil using non-synthetic change it. If you don't mind waiting until your next oil change, don't. I basically believe that any oil change is good as long as you stick to the viscosity Chyrsler indicates. If your engine is made to use non-synthetic you can use both. If the manufacturer indicates you can't then you can only use synthetic. Check out the threads on oil consumption there is a lot of good info. I would want to know if there is a difference so I would change it. If it does the same thing then your engine is at the point where it might start to use some oil. Unlike most engines, you have to be a bit more vigilant with a 3.8. My 89 4.2 still really doesn't use oil. Imagine that.
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Old 05-10-2011, 11:04 PM   #8
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Will do man thanks for the advice!

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