Hi.....new to this group...and a single female! My Caddy has recently been having issues with the air-conditioning.....seems to turn on cold then simmer out. Also one day the radio flickered on/off a few times. Made an appt with Cadillac. Unfortunately had to cancel due to a ankle injury. I have had ZERO warnings and no odd sounds. The other day I was driving to work and I heard a weird noise...thought it was the scummer car in front of me. All if a sudden my car felt sluggish and as I exited the highway and slowed to a stop at a major intersection in Las Vegas ....the check engine light came on and my car died. The shop is telling me I had ZERO oil in my car, probably blew a piston and I need a new engine!!! Why in the world would my Cadillac NOT give any warning if I had ZERO oil!!! There has never been a knocking noise, no signs of an oil leak! Granted my last oil change was in Sept. But I don't drive far or hardly at all. My car always alerts me when there is an issue. HELP PLEASE!!! Very confused and NOT paying 8k for a new engine!