2007 Jeep Liberty - Help ! Can't get the oil dipstick back into the tube! Goes in about 3/4 of the way and jams - feels like it's hanging up on something. This is what I did: pulled it out, wiped it off, slipped it back in, pulled it out again to check the oil. Now it won't go back in. (No - I didn't put anything else down there!) The dipstick has this little twisty bit at the end - is there a valve in the tube it's supposed to slip through? This is my only car and I travel to work. Can I drive it without a dipstick?