Hello everyone. Nice forum here. I'll get right to the point. I've got a 99 jeep cherokee with the 4.0. It has 111,000 on the ticker. I've always had someone else change the oil and not very regularly tbh. I've decided that it's time to start doin this crap myself. I know all the basics of oil changes and what not but I am unsure if I should switch to a synthetic or stick with dino. Also I would like to run a detergent or something to clean it up a bit. I have a few small oil leaks, small rear main leak and what I'm hoping is a pan gasket leak in the front, however I suspect it's coming from higher up. So in a nut shell what should I do to get this thing back on track. Oil, filter and addative info is appreciated. Sorry for the ramble.