Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the oldest model Porsche v12 that has points less than or equal to 0.

### Inputs:
table_name: table, columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']

### Response:
SELECT MIN Year FROM table WHERE Engine = porsche v12 AND Pts. < 0