Corrosion has long been a concern for car owners, but modern vehicles seem to be rusting faster than before. While technological advancements have improved many aspects of automotive manufacturing, rust protection has not kept pace. Cost-cutting measures and environmental regulations are some of the key factors contributing to this growing issue.
Which Cars Are Most at Risk?
Historically, Japanese vehicles have been more susceptible to rust than their European counterparts.
According to rankings from the Swedish magazine Vi Bilägare, brands such as Honda, Suzuki, Subaru, and Toyota score poorly in corrosion protection.
In contrast, German and French manufacturers, including Porsche, BMW, and Renault, offer better factory-applied rustproofing.
One major factor is the type of steel used in production. Japanese automakers often source steel from China, which is stored and transported in humid conditions before assembly.
Additionally, the shipping process exposes these vehicles to salty sea air, further increasing corrosion risks before they even reach customers.
As reported by Autokult, rust issues are particularly severe in vehicles with body-on-frame construction, such as the Toyota Hilux, Land Cruiser, and Suzuki Jimny. These cars can develop rust on their frames and undercarriages within just a year of use.
The Role of Manufacturing and Climate
European automakers have traditionally placed greater emphasis on corrosion prevention. Brands like Audi and Volvo have been known for using high-quality coatings and thicker steel, which enhances durability.
However, even these manufacturers have started reducing protective measures due to cost considerations and environmental regulations that limit the use of certain chemicals.
Italian brands like Fiat and Alfa Romeo also struggle with rust protection, though their issues are less severe than those of Japanese manufacturers.
Why Is Rust Protection Worse Today?
In the past, cars were built with thicker steel, and many were regularly stored in garages, protecting them from harsh weather conditions.
Today, vehicles are lighter and use thinner metal to improve fuel efficiency, making them more vulnerable to rust.
Additionally, many modern cars are part of company fleets, where long-term rust protection is not a priority. Once these vehicles enter the used car market, their corrosion issues become more apparent.
Environmental considerations also play a role.
Stricter regulations have led to thinner layers of paint and reduced use of protective coatings. Some new cars even show early signs of corrosion while still in the showroom.
What Can Car Owners Do?
Factory-applied protection is often insufficient, so additional rustproofing treatments are recommended, especially for those in humid or coastal regions. Regular maintenance, such as washing off road salt in winter, can also help prolong a vehicle’s lifespan.
As cost-cutting continues to influence car manufacturing, rust may remain a persistent issue for modern vehicles.
