Bought my 2004 Jeep Liberty 4WD new. At 225K miles had blown engine replaced with a Jasper engine. At 245K miles replaced transmission replaced with a Jasper transmission. Both are performing well and currently have no known major issues. Just ongoing check engine light and electric window motor issues. Currently I have 250K miles and plan to take a 5K mile trip. What preventive maintenance suggestions do you suggest doing? This is my daily driver and I want to keep it but I have been told that although the engine and transmission should be good, I will start experiencing and onset of problems with old wiring harness, sensors, etc. I'm 4 times the age of my Jeep and no longer do my repairs. If these problems begin, should I keep doing repairs or sell it now, while everything is in good repair and upgrade to a newer vehicle? You recommendations/advice will be appreciated.