TreeSemdyZee

I'm going to have to say that if you changed your own oil, you really don't have much of a leg to stand on honestly. Relying on the oil light to tell you that your oil is low is like playing Russian Roulette with 5 bullets. That's what they make a dipstick for.
Do you change the crush washer when you change your oil? That's the first thought that came to my mind was that all of the oil leaked around the filter. Just a WAG, but something to ponder. I would sure do my best before they try to clean of any part of the engine to figure out where the oil came out. If you had actually burned that much oil, you would have noticed it, so I think leaking is your only option.