CONSUMER WAS TRAVELING ABOUT 25MPH ON A SIDE STREET WHILE IT WAS RAINING AT THAT EVENING. SHE WAS GOING DOWN A MOUNTAIN HILL AND VEHICLE STALLED WITHOUT PRIOR WARNING. VEHICLE STARTED TO SLIDE TO LEFT INTO THE CROSS LANE. SHE APPLIED BRAKES, AND THERE WAS NO RESPONSE. THEN, SHE SLAMMED INTO A MUD ENBANKMENT. STARTED VEHICLE UP, AND SHE DROVE AWAY TO THE SERVICE DEPARTMENT. A WEEK BEFORE THAT INCIDENT, SERVICE DEPARTMENT KEPT VEHICLE FOR FIVE DAYS. MECHANIC GAVE HER SERVERAL PAGES OF INVESTIGATION OF VEHICLE, AND TOLD HER THAT SHE HAD TO USE SUMMER BLEND GASOLINE SO THAT HER VEHICLE WOULDN'T STALL. *AK