Bought the Jeep in December, rental return. Noticed a rough idle and took it in, dealership took good care of me. Diagnosed the problem as broken locks on the valves. Spent 2 days in the shop. They replaced valves and locks on all cylinders. First time they replaced 1,3,5 and then 2,4,6. Does seem to run much smoother when at idle. All covered by warranty ($1671).

Questions I have: Is this a bad sign of things to come? Mileage has been running about 14MPG - will this change have any (positive) impact on my MPG?

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2006 Liberty Sport

You could try Synthetic oil during the next change and physically check all the hoses and lines for leaks. Watch out for any engine codes to pop up on the odometer also.

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2002 Liberty Limited
2.5" Rusty's Coil Lift + OME 927 springs + 1/4" spacers
265x70 Revos
Warn 4x Floods
ARB bumper
TeraFlex extended front bumpstops
Rock Lizard Skink Super Sliders
Bosch Size 86 battery
Jeepin by Al's 4.5 UC Arms
Kryptonite Differential Cover
JBA Bolt on KJ Tri-Angulated 4 Link