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

### Instruction:
What is Brown Motors best point total using the Offenhauser L4 engine since 1950?

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

### Response:
SELECT MAX Points FROM table WHERE Year > 1950 AND Engine = offenhauser l4 AND Entrant = brown motors