Blue/white smoke coming from exaust
I am new to the forum, I have an issue with my used 2003 BMW 540I, it's kind of a long story but to get the proper response, I think that you should know the full story.
A couple of weeks ago, my car were towed for not having the proper decals only a couple of days after my birthday. I got the car from the towing company a couple of days later, it was only a few mile from my home, drove the car home fine without any problems. The next day I drove down to my mom home which is about 30 minutes away from me, when I got to her house, my car was leaking fluids. It turned out to be antifreeze, so I put water back in it and some extra water in bottles for the drive home “first mistake". I got just about all the way home and the car ran hot and I pulled over to add more water but as fast as I put it in it ran out. I finally made it home car smoking and all that. I had to replace the overflow reservoir for the coolant, and the hose that goes from the radiator to the engine. I refilled car with proper coolant and started it to let it run, when I cranked it up, I got blue/white smoke from the exhaust; I thought that might have been from the coolant just being added. I drove the car the next day and still got smoke from the exhaust, but the car was not over heating and the temp gauge stayed in the middle. Then the car started driving very rugged like it was going to shut off at every stop, then the check engine light started flashing as I accelerated the car. I did some searching on the internet and called BMW repair and they told me that the check engine flashing has something to do with the emissions. I took the car in to them and had them do diagnostic and it was found that number 1 coil was not firing, so had that replace along with all the spark plugs. The car is not running rugged any more but I still have blue/white smoke coming from the exhaust. Can anyone give me any suggestions on what could be causing this issue i.e. piston rings, head gasket. If it either of those is it worth spending the money to have it repaired. The car had been running fine with out any issues at all, it does have high mileage 200,000, and advice would be greatly appreciated.