I've noticed that certain engines just seem to be built better than others when it comes to longevity. I'm trying to compile a list of the most reliable engines for longevity across different brands.
What engines have you seen consistently reach high mileage with minimal issues? I'm thinking of engines like Toyota's 2AZ-FE, Honda's K-series, Ford's 300 inline-6, Chevy's LS series, etc. Are there any modern engines that seem to be following in these footsteps?
For most reliable engines for longevity, my list includes: Toyota's 2AZ-FE (2.4L), Honda's K-series (especially K24), Ford's 300 inline-6, Chevrolet's LS series V8s, Mercedes' OM617 diesel, and Volkswagen's 1.9L TDI.
These engines have proven track records of reaching high mileage with proper maintenance. They're generally simple, robust designs without excessive complexity that can lead to failures.
I'd add Toyota's 1ZZ-FE (1.8L) to that list. That engine is in millions of Corollas and Matrix/Vibe models and is known for incredible longevity. I've seen many with 300k+ miles that have never been opened up beyond valve cover gaskets.
Also, Honda's D-series engines (1.5L, 1.6L) are practically bulletproof. They're simple, non-interference engines that just keep running with basic maintenance.
For diesel engines, the Cummins 5.9L 12-valve is legendary for longevity. I've seen several in Dodge Rams with 500k+ miles still working. They're simple, mechanical engines without all the electronic complexity of modern diesels.
Also, the Ford 7.3L PowerStroke and Chevrolet Duramax LB7 (with updated injectors) have proven to be very durable in real-world use.
Modern engines that seem promising for longevity include Toyota's Dynamic Force engines (2.5L hybrid system) and Honda's Earth Dreams engines. They're more complex, but early indications suggest they're holding up well.
The key with modern engines is that they have more systems that need maintenance - direct injection systems need cleaning, turbochargers need care, etc. They can last if maintained properly, but they're less forgiving of neglect than older engines.