user: Question: What year was the Honda RA168E 1.5 V6 T engine used?
Columns: ['Year', 'Chassis', 'Engine', 'Tyres', 'Pts. ‡']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1966.0, 'M2B', 'Ford 3.0 V8', 'F', '2']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Engine" = 'Honda RA168E 1.5 V6 T';