I think I have a horrible problem! I trying to think positive but my car sounds horrible. I took my car on a hour and a half trip this morning and it ran great all the easy there and about half way back. On my way home my car seemed to lose compression and the engine started ticking or knocking just all of a sudden. I checked the oil and it was about a quart low so I put a quart in but this didn't change anything. I did notice a leak at the oil send unit but I don't think it should cause all of this. I don't think the oil is being circulated though but I'm not a mechanic so I'm not certain. Have any of you had this issue or have any ideas? If it was something really serious would it just start all of a sudden?