Table schema:
CREATE TABLE table_name_82 (year INTEGER, entrant VARCHAR, engine VARCHAR, chassis VARCHAR)

Question: Which is the latest year that has an engine of Offenhauser l4, a chassis of Kurtis Kraft 500c, and the entrant of Federal Engineering?
SQL: SELECT MAX(year) FROM table_name_82 WHERE engine = "offenhauser l4" AND chassis = "kurtis kraft 500c" AND entrant = "federal engineering"