noun
as-new car; pre-registered car; ex-demo car
Refers to a car that is sold as used but is in near-new condition, often with very low mileage. Common in the Japanese used-car market for vehicles that were registered by a dealer for demonstration or inventory purposes, or barely driven before resale.
新古車は新車よりずっと安く買えることが多い。
You can often buy a pre-registered car much cheaper than a brand-new one.
この販売店では、走行距離の少ない新古車を多数取り扱っています。
This dealership carries many low-mileage ex-demo cars.
中古車 is a general term for any used car, whereas 新古車 specifically refers to nearly new used cars with very low mileage and often a single previous registration.
Compound of 新 (new) + 古 (old) + 車 (car), literally 'new-old car'. The term reflects the car's dual nature: it is technically used (古) but in like-new condition (新).