user: Question: What is the highest number of points the Cosworth Straight-4 engine scored?
Columns: ['Year', 'Entrant', 'Chassis', 'Engine', 'Pts.']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1967.0, 'Lotus Components Ltd.', 'Lotus 48 (F2)', 'Cosworth Straight-4', 0.0]
SQL:

assistant: SELECT MAX("Pts.") FROM "Table" WHERE "Engine" = 'Cosworth Straight-4';