(lack of) Oil Problem with my 5.9
Well I changed the oil today... got a whopping quart and a half of tar-like oil out of the pan and filter. I added a quart last week when the oil pressure was occasionally dipping down, and then it stayed stable over 35PSI, the other day I noticed it dipping occasionally again. I figured I had the wrong dipstick since it had trouble going in, and I had consistent oil pressure. Well low and behold, I had been running my jeep with almost no oil in the engine.
5 quarts later, the oil pressure is consistently at 35 during idle (just like before), and goes to around 40-45 under load. There are no strange sounds coming from the engine (likewise there were no visible metal filings in the oil), just the ticking of the injectors.
My first question would be, do you think I did any damage to the engine? There was always oil pressure (except during hard turns), I never had a check gauges light, and never heard and still don't hear any sounds that would suggest the engine was or is starved of oil.
My second question would be, where the hell did all the oil go? The exhaust is crystal clear, the coolant appears clean (plus 4 quarts of oil don't disappear into the cooling system), there are no visible leaks, and there is no smoke from oil dripping onto the exhaust.
I am going to be monitoring oil consumption (if any) over the next 100 miles, I only put 800 on it since I got it (and had it inspected, screw that shop), and then am going to change it again (the oil in the pan is a bit dirty now after idling for 10 mins with whatever else had been sitting in there). Also, I had it checked over 2 weeks ago when I had it aligned and they claimed it was fine.