See this thread, lots of good info:
viewtopic.php?t=83341It is very concerning that you are seeing it on the oil filter. I would think that any leak in the EGR cooler area (drivers side of engine) coolant would be dripping off of the starter area?
There is a single large coolant freeze plug on the rear center of the head, PN 05066836AA
Item no.4 on the parts diagram below.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve