Welcome to DF
Thank you for the information. I have heard from a few members, That replacing the PCV valve has help. When replacing a PCV valve use Mopar.

 

Although I thought my troubles were over once I replaced the PCV valve (seemed to hold its own for a few weeks), the engine has again started using oil at a rate faster than I think is acceptable...about 1 quart per 800 miles. It's one thing to have to keep adding oil, but another knowing that the catalytic converter is working overtime to keep up and may fail. The inside of the tail pipe is full of greasy soot. The only suggestions my mechanic has is to switch away from the Valvoline full syn and try Mobil 1 or standard blended oil. He says it's a long shot but he's had an experience where full synthetic oil was so "slippery" it was able to migrate right out of every engine joint on a new jeep he purchased a few years ago, including slipping right past the rings and valves at a rate that's higher than desirable. Obviously you want some minor oil consumption over the course of 3-5K miles, but a quart or more every 800 is just not right. I'll try an oil change. If that's no good, I'll see if the mechanic can isolate the problem. The valves do seem a bit noisy at times.

 

It sounds like the oil control rings may be sticking. Since the front 3 plugs are extremely easy to remove, see what they look like as in sooty or clean. Many people like Seafoam for problems like this.

 

I guess I have been having the same issues in my 3.8L grand caravan, but my catalytic converter has already been replaced. Had to, the O2 sensors would not work. I will check out the PCV valve, but I like the others, don't believe that it is the issue. I want to try and solve this before the replacement converter goes. I am thinking about trying Slick 50. I tried it in a ford ranger and it coated the engine well. Maybe it will help coat the engine and keep it from having the oil disappearing issue.

I did see an article about a 3.8L jeep engine that has a porous front timing cover that mounted to the block..? It was service bulletin #09-008-07 under engine dated Nov. 7, 2007.

 

any success with your oil disappearing problem?

 

We had the same issue in our 02 Chrysler T/C 3.8 control rings sticking ran across a product called Auto-Rx and it worked for me.

 

I too had trouble replacing the PCV on my 3.8L Grand Caravan. I did it because my machanic said he thought it would solve my oil burning problem. Adding 1 qt. every 1200 miles on a vehicle with 53K doesn't seem right to me. I will wait and see if it works but I have my doubts.

 

Welcome to DF
Chrysler has writen if you are using a Qt every 900 to over one thousand miles is normal.

 

My 2007 Dodge Grand Caravan (with an Automatic - 3.8L engine) began using 1 quart of oil every 900-1000 miles with 85,000 miles on it. I was told by two separate Dodge service centers that it is acceptable for the Dodge minivans after 1990, with 90k miles, to use a quart every 750 miles. After 50k miles, it was acceptable for them to burn a quart every 500 miles.
I have an extended warranty (100k miles/5 years). It is still under warranty. However, they said it is working as it should. No fix covered.
Not sure what my options are now...

 

If its not the PCV and its not leaking, then it is probably the oil control rings, it's been said here a number of times. If the PCV valve is old and it has any oil leaks, change the PCV, fix the leaks then re-measure the oil consumption.

If you find that it is still consuming oil after this then seafoam and auto rx were both recommended earlier in this thread. Basically you are looking for an engine treatment that will help free the stuck oil control rings. They all have their benefits and risks, I have not personally used any of them for this purpose so I can't offer much applicable advice on which product to pick.