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Old 05-05-2015, 04:25 PM
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oil problem

2010 jk sport 116,000 miles. I change my oil pretty regularly around 3 to 5000 miles and always have. This time around I noticed much less oil draining out. I think there's an issue......How do I tell if it's burning or if it's leaking? No oil spots in my driveway other then the few drops I've spilt over the years of changing my own oil.......No blue smoke or strange smells.....I'm thinking maybe the seal around the oil pan? Maybe it only leaks when I hit a bump? Help! Thanks

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Old 05-05-2015, 04:33 PM   #2
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Are you are using how much oil appears to drain at oil changes instead of how much shows on the dipstick between oil changes to gauge consumption?

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Old 05-05-2015, 04:37 PM   #3
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It sounds like you're burning oil. Some 3.8's burn oil a lot sooner than 116,000 miles. You won't see blue smoke or smell it because the cat converters burn it. At 116,000 miles you're due to replace the PCV if it hasn't been done. Doing that and using 5W30 weight oil has helped with consumption issues with 3.8's. Check the oil level often to see how much you're using at whatever mileage. The oil level has to be checked at least every 3 wks or every 2nd or 3rd fill up if you're not doing that already.
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Old 05-05-2015, 05:37 PM   #4
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If it was leaking you would see it under the jeep--maybe not dripping but there would be some on the underside of the engine. The dip stick is the only way to know if there is any oil use between changes--not how much drains out--that is too hard to measure
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Old 05-05-2015, 06:20 PM
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Thank you, I just researched the pcv valve and replaced that. It was 10 bucks and took about 10 minutes.....hopefully that helps......also I do notice some oil residue where the oil pan meets the engine, which is why I thought maybe a seal, but it looks evenly dispersed around the entire seal and doesn't look fresh, definitely no drips....anything else it could be? I'll keep checking regularly, maybe the pcv valve did the trick, thanks
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Old 05-05-2015, 07:54 PM   #6
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You never indicated how you determined that the oil level was low. Did you check the dipstick prior to draining or are you basing your oil burning/leaking diagnosis on how much oil LOOKS like came out.
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Old 05-05-2015, 08:16 PM
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It was low on the dip stick, then not a lot came out when I drained it. I didn't measure how much came out but it was way less then what should have
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Old 05-05-2015, 08:20 PM   #8
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Okay, then yeah as others have said the 3.8 burns oil, up to a quart per 1000miles so do keep a close eye on the level.
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Old 05-05-2015, 08:47 PM
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Just thought it was strange that it never had before until now.....maybe the pcv valve has corrected it, time will tell
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Old 05-05-2015, 09:04 PM   #10
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Quote:
Originally Posted by Wrangler010 View Post
Just thought it was strange that it never had before until now.....maybe the pcv valve has corrected it, time will tell
That inconjunction with using 5w30 instead of 5w20 might take care of it, or at least minimize it.
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Old 05-06-2015, 05:58 AM
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I'll switch to 5w30 on my next oil change.....why do they suggest 5w20? Any reason for that?
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Old 05-06-2015, 07:41 AM   #12
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I'll switch to 5w30 on my next oil change.....why do they suggest 5w20? Any reason for that?
slightly better fuel mileage, which helps thier overall score with the government fuel efficiency thingamabob bean count circle wank.
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Old 05-06-2015, 07:42 AM   #13
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Just thought it was strange that it never had before until now.....maybe the pcv valve has corrected it, time will tell
You never had 116,000 miles on that engine till now either!


Check the oil FREQUENTLY or you will have a repair bill of thousands of dollars. Is not very likely the PCV valve fixed your problem.
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Old 05-06-2015, 10:57 AM
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I think I agree with you, while I do think the pcv valve will help I gotta believe there's more to it then that......my jeep hasn't ever burnt oil, or maybe just an unnoticeable amount......now all of a sudden it's very noticeable which is why I think something is going on.......
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Old 05-06-2015, 12:43 PM   #15
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I bought my 07 Sahara with 104 000km on it and it burns oil, especially after I go off roading and have been revving it high. I just top it up once or twice between the 5000km on the regular oil change.
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Old 05-07-2015, 10:30 AM   #16
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Unhappy Oil Leak

I have a 2010 with a 3.8L. Bought it new. It has always burned oil since day one. Really disappointing!!! Engine has always run fine, but I have to add a quart of oil about every 2000 miles. It's the engine, not a leak........
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Old 05-07-2015, 10:46 AM
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I understand the engine is known for burning oil, but mine never did until about a month ago.....could it be bad piston rings?
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Old 05-07-2015, 10:49 AM   #18
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Oil usage will vary by engine model and how well that you have maintain it.

I have a General Motors SUV that has burned (not leaked) about 1/2 quart every 3000 miles. This usage has been that way from new day one on.

My 2003 TJ 4.0, burned about 1/4 of a quart every 3000 miles.

My 2013 JKR 3.6, is still at the top of the hash marks at 5000 miles. So no noticeable usage.

Changing your engine oil at a established interval is very important, but checking your oil level is equally as important!!!!!!!!

There was a Thread at one time, that asked the question, how often do you check your engine oil level. It was amazing how many never checked theirs, and even worse, some didn't know how to check it...

So be smart and at least check your coolant and engine oil level at gas fill ups...
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Old 05-07-2015, 10:51 AM   #19
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Quote:
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I understand the engine is known for burning oil, but mine never did until about a month ago.....could it be bad piston rings?
Yes. Worn piston rings could be it, but without opening up the engine a number of 3.8 owners reported that a PCV swap and slightly thicker oil helped a great deal to the extent that nothing else had to be done. Will it work in your case, maybe/maybe not, but it's an inexpensive first step.

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