- If you are in the market for a 3.5 EcoBoost, your budget and mileage will be two very important factors to consider.
- So what if you find a decent deal on a 3.5 EcoBoost but the mileage seems a bit high?
- Is the 3.5 EcoBoost a reliable high mileage engine and how reliable are they once it sees north of 125 000 miles?
NB: Consider the previous owner’s care for the prospective vehicle: signs of abuse, major modifications, or engine tuning. Avoid 3.5 EcoBoosts with over 125,000 miles, but the choice relies on your budget and risk tolerance. Buying used is uncertain; the truck’s price should align with its condition and mileage.
So what is the general life expectancy on a 3.5 EcoBoost? Let’s find out!
Table of Contents
3.5 EcoBoost Life Expectancy
- Avoid prolonged high RPM for your EcoBoost engine.
- Peak stresses occur during piston direction changes at top and bottom strokes, exerting force on internals like cranks, rods, and pistons.
- Higher RPM means more force during deceleration and acceleration, counteracting piston tension.
- EcoBoost’s low-down torque keeps it at lower RPMs, extending engine life.
We all know that the hard use and abuse of most engines reduce longevity and reliability very quickly. Also, major modifications like bigger tires, heavy accessories, bumpers, towing, and engine tunes all decrease engine longevity since they require to engine to work harder while carrying the additional weight.
Regular service and proper care extend the Ford 2.7 EcoBoost’s life. Stick to strict oil change intervals, using quality synthetic oil to minimize carbon build-up. Occasional 5-6000-mile oil changes between scheduled services benefit the engine.
3.5 EcoBoost Reliability
EcoBoost signifies Ford’s engineering leap: tough, smooth-running, powerful, fuel-efficient 6-cylinder masquerading as an 8-cylinder. Low maintenance and well-assembled.
- Direct fuel injection and dual overhead cams yield 365 HP & 420 TQ (Raptor’s 3.5L – 450 HP & 510 TQ).
- The engine sustains 90% peak torque from 1,700 to 5,000 RPM, a remarkable feat.
The only cause for concern with the 3.5 EcoBoost engine is with the direct injection. Direct fuel injection can cause excess carbon build-up on the valves which can harm engine performance. In 2018 Ford reviewed the design of both the 2.7L and 3.5L EcoBoost engines.
Upgrades included a high-pressure direct, low-pressure port hybrid fuel injection system which was designed to keep the valves clean and not allow excess carbon to build up. This improved engine longevity and reliability.
How Long Will an EcoBoost Engine Last
Like all Ford products, the EcoBoost is built on Ford Tough and is designed to last a long time. Both the 2.7 Ecoboost and the 3.5 engines are reported by many owners to reach well over 200,000 miles with only regular services and routine maintenance.
There is no exact amount of guaranteed miles on the EcoBoost, however many owners have made light modifications without any long-term reliability side effects. Modifications include upgrades like intakes, exhaust upgrades, and mild engine tunes without compromising the reliability or longevity of these engines.
300 000 Mile EcoBoost
Some EcoBoost owners exceed 300,000 miles. Minimal repairs reported: throttle bodies, transmission select sensors, and oxygen sensor issues affecting fuel consumption. Regular plug and oil changes maintain reliability. Recommended 6-7k mile oil changes, and fluid changes around 150,000 miles for a healthy engine and transmission.
Below is a link to an owner whose 2011 EcoBoost reached 200,000 miles – have a look!
2.7 EcoBoost 200000 Miles
Turns out the 2.7 EcoBoost is built solid as a rock with more and more owners coming out and boasting about reaching 200 000 miles on these little engines. Again the main reliability issues were minimal in the form of a few sensors. Again, regular maintenance and scheduled services are important, and changing the oil every 10,000 miles with a decent full synthetic oil helps to keep the engine and turbo happy.
However, it is recommended to carry out a 5000 mi oil change between services, since the 10, 000-mile gap is a bit too long for the oil to maintain its viscosity and continue to protect the engine. Diff and transmission oils are also changed at 150,000 miles.
If you are a road warrior and drive long distances every day it will be easier to rack up the mileage quicker without compromising reliability. One of the more common faults on these is the torque converters packing up. It appears to be a regular occurrence reported by owners of these trucks.
5.0 vs 3.5 EcoBoost MPG
The 3.5 Ecoboost is rated at 19 mpg combined (17 city, 23 hwy), and the 5.0 V8 is rated at 18 mpg combined (16 city, 22 hwy). The fuel usage difference is only 1 mile per gallon.
Engine longevity varies: Too much gentle treatment may lead to issues, while hardworking regular use easily reaches 200,000 miles.
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