As the title states, do you lube your AR with oil, grease or a combination? Personally, I prefer a quality oil. I have used everything from RemOil, Mobil 1 and to my current favorite of Slip 2000 EWL. Been using Slip 2000 EWL now for a while and have found it to run really well and it cleans up pretty easy to boot. Having said that, I truly believe a quart of synthetic 5w30 motor oil would last the average shooter (including myself) a long time and for a fraction of the cost compared to dedicated gun lubes. Interested to hear what everyone else likes and uses?