I had a coworker this weekend tell me that he was having car trouble, Was on a trip(DC from VA Beach) and he said he was hearing a noise in his engine. So he stopped and checked the oil. Come to find out he was 3 quarts low. From what I understand he filled it up and returned. Had the dealer check out the car and found no leaks, or anything wrong with the engine. The coworker did say when he went to add the oil, the top of the filler cap had a bunch of crude on it. I am going to take a look at the inside of the valve train with a lite today. I'm sure he probably has some scorched bearings. The car is a 98 Dodge Caravan with a V-6. I am going to Recommend an Auto R-X application, then eventually a switch over to Amsoil. I guess he had the oil changed yesterday. I told him to run that about 1500 miles then change it out again, then the last 500 of that change add the auto-rx. After that go to synthetic. How much long term damage would be caused from running that low on oil? Anyone have experience with this?