535 shutdown/no start issue
Went to start the car on a cold night (maybe 4 degrees), startup was normal. Got out of the car to open the garage door, came back to a low oil pressure warning. Reved up engine to 2k thinking maybe just the cold and low idle causing the warning. After about three seconds the car shut down completely (engine, dash light, gauges, ect.) the car now will only turn over but will not start. No codes as the battery is too low right now. I plan on putting a charger on it this weekend to see what happens. The engine did not make any abnormal noises when it was ruining(loud ticking, knocking, piston slap). Just looking for input on where to start, I have not been able to look at it, planning on spending time out in the garage on Saturday. Thanks in advance for any input. The oil level was full according to idrive 3 days ago, no pools of oil anywhere I parked.