The $10K limit is for currency. Everyone has to declare on airline arrival form if you are bringing over $10K or its equivalent in any currency. It has NO relevance to B4/B4A or the value of the goods.
With respect to the question of car imports, Please refer to
1 http://www.milgram.com/ignitionweb/data/ddm/658/CBSA_Settling.pdf
2 http://www.cbsa-asfc.gc.ca/publications/pub/bsf5048-eng.html
Personal effects can include any kind of pleasure vehicles such as passenger cars, pickup trucks, camper trucks, vans, jeeps, chassis cabs, motorcycles,
snowmobiles and motor homes, as long as you use them for non-commercial purposes. However, you should be aware that Transport Canada has many restrictions on vehicles.
Transport Canada defines a vehicle as any vehicle that is capable of being driven or drawn on roads, by any means other than muscular power exclusively,
but not including a vehicle designed to run exclusively on rails. Trailers such as recreational, boat, camping, horse, and stock trailers are considered vehicles, as are wood chippers, generators, or any other equipment mounted on rims and tires.
Transport Canada requirements
Transport Canada's requirements apply to vehicles that are less than 15 years old, and to buses manufactured on or after January 1, 1971.
Vehicles manufactured to meet United States safety standards do not comply with Canadian standards.
As the importer, before you import your vehicle, you must contact the Transport Canada's Registrar of Imported Vehicles (RIV) to ensure that it is
admissible for importation and can be modified to meet the Canadian standards after you import it.
The RIV is an agency contracted by Transport Canada to administer a national program to ensure that imported vehicles are brought into compliance
with Canada's safety standards.
