der Gebrauchtwagen
used car
A car that has already had one or more previous owners; a second-hand vehicle.
Für mein erstes Auto habe ich mir einen günstigen Gebrauchtwagen gekauft.
For my first car, I bought an inexpensive used car.

used car
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used car
A car that has already had one or more previous owners; a second-hand vehicle.
Für mein erstes Auto habe ich mir einen günstigen Gebrauchtwagen gekauft.
For my first car, I bought an inexpensive used car.

The word is a clear compound of 'gebraucht' (used) and 'Wagen' (car). 'Gebraucht' is the past participle of 'gebrauchen' (to use) and here means 'used' or 'second-hand'.
Ein neuer Wagen war zu teuer, also entschied er sich für einen Gebrauchtwagen.
A new car was too expensive, so he decided on a used car.
In connection with 'Gebrauchtwagen' (used car), the verbs 'kaufen' (to buy), 'verkaufen' (to sell), and 'suchen' (to look for) are often used. A person who sells used cars professionally is a 'Gebrauchtwagenhändler' (used car dealer).
Er sucht seit Wochen online nach einem guten Gebrauchtwagen.
He has been looking online for a good used car for weeks.
Common adjectives that describe a 'Gebrauchtwagen' (used car) are 'günstig' (inexpensive), 'zuverlässig' (reliable), 'gut erhalten' (well maintained), or 'alt' (old).
Trotz des Alters ist es ein sehr zuverlässiger Gebrauchtwagen.
Despite its age, it is a very reliable used car.
classic car / old-timer
'der Oldtimer' and 'der Gebrauchtwagen' can both be cars that are not new. The important difference is: a used car has already had one or more previous owners. It can be almost new or already older. An 'Oldtimer' is a particularly old, usually well-preserved vehicle and is often something special for collectors. Learners may confuse the words because neither refers to a new car. If you only mean that a car is second-hand, you say 'Gebrauchtwagen'. If the age, good condition, and special value are important, you say 'Oldtimer'.

Lisa kauft einen Gebrauchtwagen, weil ein neues Auto zu teuer ist.
Lisa is buying a used car because a new car is too expensive.
In der Garage steht ein roter Oldtimer aus den sechziger Jahren.
There is a red classic car from the sixties in the garage.