All vehicles have to be fifteen (15) years old or older as determined by the month and year in which the vehicle was manufactured.
http://www.tc.gc.ca/eng/roadsafety/safevehicles-importation-other-than-index-446.htm
All imported used vehicles and machinery that are contaminated with soil will be refused entry.
Reference
CBSA (Canada Border Services Agency)
http://www.cbsa-asfc.gc.ca/import/menu-eng.html
Other
Embassy of Canadian
http://www.canadainternational.gc.ca/japan-japon/index.aspx?lang=eng
Port
Halifax, New Westminster