A friend at work has an 2008 JK with the 3.7 and about 55k miles. It seems to be eating several quarts of oil between oil changes. It's not leaking anywhere that can be seen and it's not smoking. During some research on the net, it seems that this is common and according to Chrysler, using 1 qt every 1k miles is not excessive. Have any of the JK owners experienced this? If so, is there fix or do you just have to live with it?