CREATE TABLE table_name_1 (engine VARCHAR(255), rounds VARCHAR(255), driver VARCHAR(255), tyres VARCHAR(255), chassis VARCHAR(255))
What engine was used during the race driven by Jan Lammers using a chassis of d3 d4, making a tyre of g and rounds of 4-6?
    
SQL: SELECT engine FROM table_name_1 WHERE tyres = "g" AND chassis = "d3 d4" AND driver = "jan lammers" AND rounds = "4-6"