Won't start, and dropping oil level

[tconnarn]

Ok, so i replaced the ignition switch last night, and it started up after that. i restarted it 4-5x to test it, and it seemed to work well. then this morning, it did the same thing as before: dash lights came on, radio, air vents, etc, but only total silence when i turned the key to start the engine. i have a new starter, and am waiting only for the 2 new starter bolts to arrive before installing it. do you think it may be the starter instead? possibly something else? it was below freezing this morning when the car didnt start