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Old 04-06-2012, 11:05 PM
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oil is disappearing

i have a 2008 grand cherokee with 45000 miles on it... i went to change my oil today and the old oil that came out total about 4qts meaning over the 6 months and 4000 miles 2 quarts have either been used by the engine, im burning it(which i dont think is the case or the oil trolls r taking my oil... i use pennzoil platinium 5w20 all the time and this isnt the first oil change ive notice this happening... ive heard some ppl say that a quart low between oil changes is somewhat normal but i think that 2 quarts is a little much and i would just like to hear what other ppl think about this situation... any suggestions or diagnoses would be much appreciated.
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Old 04-06-2012, 11:26 PM
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Re: oil is disappearing

i think you are either leaking it or burning it 2 quarts seems like too much. do you ever see blueish smoke? if so you are burning oil.
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Old 04-06-2012, 11:39 PM
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Re: oil is disappearing

check your oil cooler line...just behind the radiator on the bottom of the engine
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Old 04-07-2012, 12:02 AM
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Re: oil is disappearing

What engine?

If no leaks are found and it's a Hemi check the back of your throttle body blade. It's probably caked with oil junk. Clean it, get a catch can and replace the PCV.

Also check the oil filter to the block adapter. Valve lash and seals are another area.
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Old 04-10-2012, 08:37 PM
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Re: oil is disappearing

I went through a similar situation as your describing when I bought my jeep. I was also using the pension platinum 5w20. It would use a quart every 320 miles. I went to conventional oil and it used a quart at about 760 miles. Chrysler says 1 quart every 1000 miles is within spec. I say BS.

Check your valve cover seals also for leaks. Mine were leaking down where the spark plugs are and the coil pack sockets were 1/2 full of oil.

Mine never smoked or leaked oil. Mine then threw a code for the cam shaft and crank misalignment and then knocked so bad it sounded like a Ford 7.3 diesel. The dealer put a new long block in under warranty. That was at 50k. I am now at 121k with zero issues.

They never could tell me where the oil was going. It ran great the entire time except when it threw the final code.

I have have stayed with my penzoil 5w20 conventional oil and hasn't used a drop with the new long block.

I hope yours is something simple. The cost of a new long block only is $6850.00. That does not include any labor.
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Old 04-11-2012, 12:12 AM
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Re: oil is disappearing

I think chrysler actually says something like 1qt to 750 miles above 50k miles... Ill have to look around to see where I saw that. Ultimately while I have a completely fresh top end I do have almost 190k on my motor (4.7l) and I use little to no oil between oil changes (that I do more frequently than many, 3k miles). I start my oil change cycle in the safe zone and drain it when its in the safe zone. (knock on wood).
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Old 04-11-2012, 08:38 AM
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Re: oil is disappearing

Quote:
Originally Posted by 2005JGC View Post
I think chrysler actually says something like 1qt to 750 miles above 50k miles... Ill have to look around to see where I saw that. Ultimately while I have a completely fresh top end I do have almost 190k on my motor (4.7l) and I use little to no oil between oil changes (that I do more frequently than many, 3k miles). I start my oil change cycle in the safe zone and drain it when its in the safe zone. (knock on wood).
x2 - I don't know what Chrysler considers within an acceptable range, but I can say the my 5.7 with almost as much mileage as above goes through maybe 1/4 - 1/2 a quart every 3000 miles. I never have to add more than 1/2 a quart total between oil changes to keep it at the top of the "safe" range on the dipstick. Used synthetic since day 1.
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Old 04-11-2012, 09:53 AM
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Re: oil is disappearing

If it is a hemi and only 4 quarts came out, it lost close to 3 quarts in 4000 miles. Either it is leaking, or burning and you should be able to see and smell it if it was burning, so has to be leaking somewhere. My 5.7 has never needed any topping off between changes, full synth 5w20, at 7,500 mile intervals, and has 75k.
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Old 04-11-2012, 03:46 PM
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Re: oil is disappearing

My jeep never smoked or leaked oil when I was having problems. I wish you luck with yours. It was very frustrating.

Check your Pcv to see that it is working. If its not it will suck oil and burn it that way.

Good luck.
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Old 04-15-2012, 08:55 AM
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Re: oil is disappearing

Quote:
Originally Posted by Whassupejg View Post
i have a 2008 grand cherokee with 45000 miles on it... i went to change my oil today and the old oil that came out total about 4qts meaning over the 6 months and 4000 miles 2 quarts have either been used by the engine, im burning it(which i dont think is the case or the oil trolls r taking my oil... i use pennzoil platinium 5w20 all the time and this isnt the first oil change ive notice this happening... ive heard some ppl say that a quart low between oil changes is somewhat normal but i think that 2 quarts is a little much and i would just like to hear what other ppl think about this situation... any suggestions or diagnoses would be much appreciated.
Generally, what everyone else said. When new, my '08 HEMI was on dealer dino oil and used 1 qt every 1K miles. I felt this was excessive for a new modern engine. Chrysler said 1 qt every 1K miles is within normal limits (WNL). Ford has said the same thing and so does a mechanic that I trust.

I changed to 5W-20 full synthetic after 35K miles (engine break-in period) and the oil consumprion decreased (so did "HEMI tick"). I also think some of this "burning" is coming from oil vapor that gets sucked out of the crankcase atmosphere via the PCV valve. These 5.7L HEMI's seem to have high-flow PCV systems.

Addition of an oil catch can (Billet Technology or equivalent) will demonstrably show how much oil passes through and into your intake manifold and the back of the throttle body.

Also, recommend you change the PCV valve at 60-75K miles. Even though the valve plug still rattles, the spring probably gets fatigued and weak.
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