CREATE TABLE table_70082 ("Year" FLOAT, "Entrant" TEXT, "Chassis" TEXT, "Engine" TEXT, "Pts." FLOAT)

What is the oldest model Porsche v12 that has points less than or equal to 0.
SELECT MIN("Year") FROM table_70082 WHERE "Engine" = 'porsche v12' AND "Pts." < '0'
SELECT MIN("Year") FROM "table_70082" WHERE "Engine" = 'porsche v12' AND "Pts." < '0'