Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_98 (year INTEGER, engine VARCHAR, pts VARCHAR)
### Question:
What is the oldest model Porsche v12 that has points less than or equal to 0.
### Answer:
SELECT MIN(year) FROM table_name_98 WHERE engine = "porsche v12" AND pts < 0