Is it bad if the engine has been repaired?

[VanMiles]

An engine that has been repaired does not necessarily mean it has become bad. Here is the relevant content: 1. Car engine: It is the device that provides power to the car, serving as the heart of the vehicle, determining its power, fuel efficiency, stability, and environmental performance. Depending on the power source, car engines can be categorized into diesel engines, gasoline engines, electric motors for electric vehicles, and hybrid engines, among others. 2. Working principle: A four-stroke gasoline engine mixes air and gasoline in a certain proportion to form a good combustible mixture, which is drawn into the cylinder during the intake stroke. The mixture is compressed, ignited, and burned to generate thermal energy. The high-temperature and high-pressure gas acts on the top of the piston, driving it to perform reciprocating linear motion, thereby outputting mechanical energy through the connecting rod, crankshaft, and flywheel mechanism. The four-stroke gasoline engine completes one working cycle during the intake stroke, compression stroke, power stroke, and exhaust stroke.

[SanRachel]

I don't think a repaired engine is necessarily bad—it all depends on how it was fixed and who did the work. I've experienced several cases where, after my car's engine had issues, a professional repair shop did a thorough overhaul—like replacing worn parts or cleaning carbon buildup—and the performance actually became more stable, even extending its lifespan by a few years. Choosing a reliable mechanic is crucial because poor-quality repairs, such as using non-OEM parts haphazardly, can easily create hidden risks. Additionally, repairing is much cheaper than replacing the entire engine and is more eco-friendly, avoiding the waste of resources needed to manufacture a whole new unit. If you maintain it well after the repair, regularly checking the oil and cooling system, the engine can still run smoothly. Just don't take the seller's word for it—always review the repair records and test-drive the car to ensure there are no issues.

[OStella]

As an average car owner, I always have some concerns about repaired engines, since they might have had major issues before. When buying a used car, if I find out the engine has been repaired, I become more cautious, worrying it might fail again and cost me unnecessary expenses. For example, my colleague's Chevrolet had its engine repaired—it ran fine for the first two months, but then the belt snapped, forcing a major overhaul. The value of a used car is also affected; repaired cars often sell for less. However, if it's just minor repairs like replacing spark plugs or cleaning fuel injectors, that’s not a big deal—in fact, it suggests good maintenance. Overall, a repaired engine isn’t necessarily a bad sign; the key lies in the depth of the repair and quality control.

[MacKarter]

From a cost-saving perspective, repairing an engine is often more economical than replacing it, especially for older car models. A new engine can cost tens of thousands more, while repairs may only require a few thousand. As long as the repairs address the correct issues, such as replacing worn bearings or seals, the engine can run smoothly for several more years. However, be cautious when buying used cars—the price should reflect any repair history. Not all repaired engines are bad; the key is to thoroughly check repair details to avoid being scammed.