2015 Buick Regal

DRIVER SIDE HEADLIGHT IS RETAINING WATER/LIQUID. WHEN I BOUGHT THE CAR IN 2015, I WAS TOLD THAT MY TIRES WERE NEW; THEN 2 YEARS AGO, I WAS TOLD THAT I NEEDED TO REPLACE TWO OF THEM. NOW ONE OF THE TWO ORIGINAL PIRELLI TIRES HAS PITS AND CLEARS CHUNKS MISSING FROM THE TIRE BASE, AS WELL AS MANY CRACKS THROUGHOUT THE ENTIRE TIRE! LASTLY, THE CAR HAS A HABIT OF LOCKING THE DOORS ON ITS OWN AND KEEPING THEM LOCKED, THEREBY MAKING IT IMPOSSIBLE TO GET IN. THE MOST RECENT TIME, I CALLED ONSTAR...AND DIDN'T EVEN SPEAK TO ANYONE, BUT THEY MIRACULOUSLY OPENED AND THE REMOTE WORKED FINE...AGAIN! VEHICLE HAS UNDER 49000 MILES ON IT! VEHICLE HAS ALWAYS BEEN SERVICED BY ARNOLD CHEVY / BUICK AND NO ONE ELSE! OH, AND JUST A COMPLAINT FROM WHEN I PURCHASED THE VEHICLE: I WAS NEVER TOLD THE CAR NEEDED PREMIUM GAS FOR BEST TURBO PERFORMANCE; I WAS TOLD THAT AFTER OWNING THE VEHICLE 3 YEARS, AFTER THE WARRANTY EXPIRED AND I COMPLAINED OF THE ENGINE LAGGING.