2006 BMW 760LI Engine And Engine Coolingengine Problems

I AM THE OWNER OF A 2006 BMW 760 LI, PURCHASED IN LATE 2008 FROM A GEORGIA DEALERSHIP AND SHIPPED TO HONOLULU. MY WIFE IS THE PRIMARY AND DAILY USER OF SAID VEHICLE. CURRENTLY, I'M SO AFRAID FOR MY WIFE, PASSENGERS AND MYSELF WHEN ENTERING THIS VEHICLE DUE TO IT'S UNSAFE AND HAZARDOUS STATE. I DON'T KNOW WHAT TO DO OR IF I HAVE A RIGHT TO BUT, I'M HOPING FOR ASSISTANCE TO HAVE MY VEHICLE OPERATING AGAIN IN PROPER WORKING CONDITION. THE FOLLOWING COMPLAINTS ARE WITH BMW OF HONOLULU (BOH) SERVICE DEPARTMENT. I CHOSE BOH BECAUSE I THOUGHT THEY WERE THE MOST REPUTABLE AND BEST QUALIFIED BMW SERVICE CENTER HERE IN HAWAII, SO I THOUGHT. FIRST COMPLAINT, COOLANT LOW LITE ILLUMINATED ON AT LEAST FIVE SEPARATE OCCASIONS. SYSTEM WAS TROUBLESHOT, PARTS REPLACED AND STILL LEAKING APPROXIMATELY 4 CUPS PER MONTH, I WAS CHARGED FOR REPLACEMENT OF PARTS. 2ND COMPLAINT,...