Super Duty trucks

3 Things Your Friend with a 6.0-Liter Power Stroke Doesn’t Want You to Know

The 6.0-liter Power Stroke was a diesel V8 engine that Ford offered in their Super Duty trucks from 2003 to 2008. It has sparked considerable debate among truck enthusiasts, with opinions varying widely. Some argue that the 6.0 is as efficient and dependable as other Ford F-250 models with a Power Stroke engine, while others believe it is prone to premature failure, unlikely to last even up to 100,000 miles.

The reality lies somewhere in between: Ford rushed the development of this engine to meet 2003 emissions regulations, leading to one of its less reliable modern engine offerings. Consequently, it has become the subject of numerous urban legends and discussions. However, some 6.0 owners have managed to achieve high mileage on their Fords. The key factors influencing its longevity often include diligent maintenance and careful usage.

Super Duty trucks
Super Duty trucks

Lie 1 – This engine was ruined by tuning for too much power

An urban legend surrounding the 6.0-liter Power Stroke is that the International Harvester version is more reliable, and Ford’s tuning for increased power is what caused additional issues. While it’s true that the Ford version has some unique problems, they are primarily related to its emissions reduction systems rather than the increased output.

There is a partial truth to this legend. Ford indeed pushed the 6.0’s power close to the limit of its stock head bolts, which can lead to blown head gaskets if further tuned without swapping to head studs. This highlights the importance of being cautious with engine modifications to maintain the engine’s reliability.

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Lie 2 – It’s more fuel efficient than older diesels

At first glance, the notion makes sense: the 6.0-liter Power Stroke has less space for combustion and fuel compared to the 7.3-liter engine it replaced. Additionally, with newer technology, engines tend to become more efficient with each generation.

Consider the example of the 350 cubic-inch V8. Early mass-produced versions were known for being gas guzzlers in Chevy muscle cars of the 1970s. However, the latest iteration, such as Ram’s 5.7-liter engine, has significantly improved fuel efficiency, achieving similar mpg figures in every category as Toyota’s latest V6. This advancement is made possible through technologies like variable valve timing, cylinder deactivation, and a combined starter/alternator stop-go function.

However, the story of diesel truck fuel efficiency is not straightforward. Ford introduced the 6.0-liter Power Stroke in response to the EPA’s tightening restrictions on NOx emissions in 2003. While it employed the latest technology to reduce emissions and maintain performance, it came at the expense of both fuel efficiency and reliability.

As a result, a well-maintained 7.3-liter diesel Power Stroke may achieve 19 or even 20 mpg on the highway, while a 6.0-liter struggles to reach 16 mpg. Unfortunately, the EPA does not officially rank the mileage of heavy-duty trucks, leaving us with the testimonies of multiple truck owners as evidence of these differences in fuel efficiency and performance.

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Lie 3 – The 6.0 Power Stroke can’t last a long time

The 6.0-liter Power Stroke equipped Ford Super Duty trucks often face a challenge in the resale market, with low values compared to other models. For instance, a 2004 truck with only 35,000 miles recently sold for less than $24,000 on Cars & Bids, and similar trucks haven’t even reached $17,000. This situation can leave many 6.0 owners feeling stuck with their vehicles. However, the solution is not to give up and neglect maintenance, leading to the premature deterioration of the truck.

The industrial version of the 6.0, known as the VT365 and manufactured by International, has been rated for 350,000 to 375,000 miles. While there’s no guarantee that a Ford’s 6.0-liter engine will reach this longevity, some well-maintained 6.0s have indeed gone as far as 500,000 miles on a single engine.

Caring for a 6.0-liter Power Stroke requires dedication and diligence. Regularly swapping out high-quality oil every 5,000 miles is a must. Fuel filters should be replaced ahead of schedule, around 15,000 miles, and monitoring or increasing fuel psi is essential to protect the injectors (using Ford’s “blue spring kit” or PN 3C3Z-9T517-AG). The EGR valve needs to be cleaned and inspected every 20,000 miles. Coolant should be flushed every 45,000 miles, and an anti-cavitation additive should be added. Many owners also opt for an aftermarket coolant filter to further protect the system. Additionally, it’s crucial to prevent the truck’s two batteries from wearing out, as this could damage the FICM chip and leave the driver stranded.

While maintaining a 6.0-liter Power Stroke requires effort, those who diligently perform these tasks and monitor the engine find that it can serve as a reliable workhorse for many years. With proper care and attention, the 6.0 can still be a valuable and dependable asset to its owners.

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