Who has the most reliable engines?
In independent reliability surveys conducted in the 2020s, Toyota and Honda consistently receive the strongest marks for engine durability, with Mazda and Hyundai/Kia close behind. This article reviews current data from researchers and explains what contributes to engine longevity across mainstream brands.
How reliability is measured
Reliability assessments combine owner-reported problems, warranty claims, recall histories, and long-term durability records. Analysts look at engine-specific failure rates—such as timing components, turbochargers, oil consumption, head gaskets, and cooling system issues—while also accounting for maintenance practices, climate, and driving patterns. The best engines tend to come from brands that maintain rigorous quality controls and provide clear service intervals, but model-specific history matters just as much as brand reputation.
Leading brands for engine reliability
The following brands are regularly cited as delivering the most durable engines in the current market, based on multiple independent studies and long-term owner experiences.
- Toyota and Lexus engines — Toyota's powertrains are widely praised for longevity and low incidence of major failures. Popular engines such as the 2.5L four-cylinder, the 1.8L, and the 3.5L V6 in various models have earned reputations for running well beyond 200,000 miles with routine maintenance.
- Honda engines — Honda's K-series and other four- and six-cylinder families are celebrated for durability and efficient operation. While Honda has faced model-specific issues in certain years, overall engine reliability remains consistently high across generations.
- Mazda engines — Mazda's Skyactiv line emphasizes reliable, efficient design with durable blocks and cooling. Owners report low failure rates and long lifespans, though turbocharged variants can incur higher maintenance needs.
- Hyundai and Kia engines — The latest generations of Hyundai and Kia engines have earned strong reliability scores and come with generous warranties, reflecting significant improvements in design and manufacturing quality in recent years.
- Subaru engines (improved in recent years) — Subaru's engines have offered solid performance and all-wheel-drive reliability, with some generations facing concerns such as oil consumption or head-gasket issues. Contemporary designs are generally regarded as durable within their class, though experiences can vary by model and maintenance history.
Overall, the leaders in engine reliability tend to cluster around Toyota/Lexus and Honda, with Mazda and Hyundai/Kia delivering strong performances as well. Because reliability can be highly model-specific, it is wise to review the engine history and maintenance record for any vehicle under consideration.
Why these engines perform well
Several common factors underpin strong engine reliability across these brands. The following observations recur across contemporary powertrains:
- Durable engineering and materials — robust block and head materials, reliable fasteners, and proven lubrication strategies reduce wear and the likelihood of failures.
- Timing system choices — many reliable engines use timing chains rather than belts, minimizing maintenance needs and reducing the risk of catastrophic failures due to belt wear.
- Effective thermal management — efficient cooling and oil cooling help keep engine temperatures within safe ranges, extending life and reducing detonation risk.
- Quality control and manufacturing discipline — tighter production tolerances and consistent component quality lower the probability of early failures.
- Maintenance and support — strong dealer networks, widely available parts, and clear service intervals help owners keep engines in good condition over time.
However, reliability can still vary by model and generation. Some engines may be more prone to issues like oil consumption or turbo maintenance in specific configurations, so buyers should review model-specific reliability data and maintenance histories when evaluating used vehicles.
What to look for when choosing a reliable engine
Model history and maintenance records
Check the vehicle’s service history, focusing on regular oil changes, timing system work when applicable, cooling system maintenance, and turbo maintenance for turbocharged variants. A documented pattern of proactive maintenance is a strong predictor of long-term engine reliability.
Warranty and recall history
Consider the length and scope of powertrain warranties, as well as the manufacturer’s track record for addressing issues promptly. A solid warranty can offset occasional problems and provide peace of mind for used purchases.
Summary
Across current reliability studies, Toyota and Honda remain the most consistently reliable for engine durability, with Mazda and Hyundai/Kia closing the gap thanks to modern, well-engineered powertrains. Engine reliability depends on design choices, manufacturing quality, maintenance practices, and model-specific history. For buyers seeking lasting engines, prioritizing brands with proven long-term durability and researching model-level reliability data remains essential.
