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_8 (year INTEGER, engine VARCHAR, entrant VARCHAR)
### Question:
What is the average year that the Belanger Motors had an Offenhauser l4 engine?
### Answer:
SELECT AVG(year) FROM table_name_8 WHERE engine = "offenhauser l4" AND entrant = "belanger motors"