I change the oil in my 06 every 7000kms or 5000miles. I just use conventional Castrol 5w30and a quart of Lucas oil stabilizer every oil change and it works good for me.I just got my 05 liberty 3.7L 6cyl. How often should I change the oil if it has a synthetic blend?
With a synthetic blend you should change it every 5000 miles. If you upgrade to full synthetic there are some out there that only need to be changed every 10,000 and Mobil 1 actually has a 20k mile oil as well. Changing your oil is the single most important thing you can do for any vehicle.
I do the same. Keep a extra quart in the jeep and check it every fill up. Can never be too safe not worth ruining a good motor because your too lazy to check/change your oil.^ X2 Running low could = a very bad day. I keep an extra quart of 5w-30 in the jeep, and check level at every fill up.
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It is nice to see clean oil in the KJ. By 3-4K miles it is getting dirty, so I change it.