VERDICT · SIMPLER, DEPENDABLE ALTERNATIVE TO THE ECOBOOST
Ford 3.5L V6 (Duratec)
is it actually reliable?
The naturally aspirated base engine on the Explorer — no turbo, no direct-injection carbon buildup, genuinely fewer things to go wrong than the EcoBoost it's offered alongside.
ENGINE CODEDuratec 35 (Cyclone)
DISPLACEMENT3.5L naturally aspirated V6
FUEL SYSTEMPort injection
YEARS2011–2019
The short version
This engine trades the EcoBoost's extra power for genuine mechanical simplicity — no turbocharger, no water pump or intercooler considerations to screen for. No chronic issue of significant scale has been documented across its production run, consistent with Ford's broader naturally aspirated V6 reliability record.
Pros and cons
WHAT HOLDS UP
- No turbo-related wear points, unlike the related EcoBoost option
- No chronic issue of significant scale documented across its production run
- Simpler to diagnose and service than the twin-turbo alternative
- Strong parts availability given extensive use across Ford's lineup
WHAT FAILS
- Noticeably less power and towing capacity than the EcoBoost option
- Timing chain tensioner wear has been reported on a small subset of high-mileage examples
- Fuel economy advantage over the EcoBoost is modest in real-world mixed driving
- Oil consumption can appear on very high-mileage examples, typical minor wear
Where problems tend to appear
Not a guarantee, but a pattern seen consistently across owner forums and independent-garage reporting.
120,000–180,000 MIMinor timing chain tensioner wear, where present, may become noticeable.
180,000+ MICore engine internals are routinely still original and sound on documented, well-maintained examples.
Reliability by maintenance history
Service history
Overall risk
Verdict
Regular oil changes, documented
Low
Buy with confidence
Patchy but not neglected
Low
Still a safe buy
Long-neglected intervals
Moderate
Inspect thoroughly before buying
Buying one — what to check
Beyond general maintenance history, there's little engine-specific risk to flag.
If cross-shopping the EcoBoost version of the same generation, that engine's own checklist is worth reading first.
A pre-purchase inspection can reasonably be less exhaustive here than on the turbocharged alternative.
Where this engine shows up
Model-specific pages, with notes on how it behaves in that particular car.