The 6.0 Power Stroke oil cooler is one of the most consequential parts on the engine, because when it clogs it takes the EGR cooler down with it and cascades into overheating and rough running. So when it's time to replace one, the Motorcraft-versus-aftermarket question is worth taking seriously. The honest answer involves a design that was flawed from the factory and a job you only want to do once. Here's how the choice really shakes out.
Why the 6.0 oil cooler fails in the first place
The 6.0 uses a liquid-to-liquid oil cooler mounted in the engine valley. Engine coolant flows through it to pull heat out of the oil. The problem is twofold. First, the cooler's internal passages are small and easily blocked. Second, the 6.0 cooling system is a debris factory: casting sand left over from manufacturing, degraded coolant, and general sediment circulate and settle exactly where the passages are tightest. Over time the cooler restricts, oil temperature climbs, and the gap between oil and coolant temperature widens.
That restriction is also what kills EGR coolers. A plugged oil cooler drives up EGR cooler temperatures and contributes to the EGR cooler failures the 6.0 is infamous for. So the oil cooler isn't just an oil-temp part. It's upstream of one of the platform's most expensive headaches.
This matters for the buying decision because no cooler, OEM or aftermarket, survives a dirty cooling system. The part is only half the job.
The Motorcraft (OEM) argument
Motorcraft is the genuine Ford replacement, and it's what a lot of experienced techs still install. The case for it:
- Known fitment and consistency. It's the exact part, it seats correctly, and the gasket and O-ring interfaces are right.
- Proven baseline. Whatever its design limits, the OEM cooler is a known quantity that performs to the factory spec.
- No surprises on a cab-off-adjacent job. The valley work on a 6.0 is involved. OEM removes fitment guesswork from an already-annoying job.
The honest catch: Motorcraft is the same fundamental design that clogged the first time. It's not a redesigned, more-open cooler. It works, but it inherits the original restriction tendency, so its longevity is only as good as the cooling system you install it into.
The aftermarket argument
The aftermarket ranges from budget replacements to units that claim improved flow or more durable construction. The case for aftermarket:
- Some designs aim to address the restriction with revised internal passages or heavier construction.
- Price and availability can be better than OEM.
- Quality brands exist that build a solid, correctly-dimensioned cooler.
The honest catch: the aftermarket quality range is wide. A reputable-brand cooler can be a fine or even improved choice. A bottom-dollar cooler with questionable materials and loose tolerances can leak, fit poorly, or fail early, and on this job an early failure means doing all that valley work again. If you go aftermarket, buy on brand reputation, not on being the cheapest listing.
The part that actually determines longevity
Here's the truth both camps agree on: the cooler you choose matters less than the cooling system you install it into. Whether you fit Motorcraft or a quality aftermarket unit, do the supporting work or you'll be back here:
- Flush the cooling system thoroughly to get the sand and sediment out.
- Replace the coolant with the correct specification and keep it fresh on interval.
- Service the degas bottle cap and check the system for the conditions that let debris accumulate.
- Address the EGR cooler at the same time if it's suspect, since the two failures travel together and the labor overlaps.
- Use fresh gaskets and O-rings everywhere you break a seal.
Skip the flush and the cleanest new cooler on the market will plug on the same schedule as the last one.
Which should you buy
- Choose Motorcraft if you want the known-quantity OEM part, exact fitment, and you're pairing it with a properly cleaned cooling system. For most owners doing a careful, one-time repair, this is the safe pick.
- Choose a quality aftermarket cooler if you want a potentially improved design or better price and you're buying a reputable brand, not the cheapest option. Match it to the same cooling-system work.
- Don't choose on price alone. The labor to redo this job dwarfs the difference between a good cooler and a bad one.
Parts you'll need
Plan the job as a system, not a single part: the oil cooler itself plus the gasket and O-ring set, fresh coolant, and the EGR cooler service parts if you're in there. Browse our oil cooler parts for the cooler and seals. For the full platform, start at our 6.0 Power Stroke diesel parts collection, organized by engine so you confirm fitment for your application.
FAQ
Is the Motorcraft cooler better than aftermarket? It's the proven OEM design with guaranteed fitment, but it's the same restriction-prone geometry that clogged the first time. A quality aftermarket unit can match or improve on it. The bigger variable is your cooling-system cleanliness.
How do I know my oil cooler is clogged? A widening gap between oil temperature and coolant temperature is the classic tell, along with rising temps under load. It often shows up alongside EGR cooler symptoms.
Should I do the EGR cooler at the same time? If it's suspect, yes. The failures are linked and the labor overlaps heavily, so doing both together saves you a second teardown.
Where we land
Motorcraft is the safe, known-fitment choice. A reputable aftermarket cooler can be equal or better if you buy on brand, not price. But the real determinant of how long your new cooler lasts isn't the box it came in, it's whether you cleaned the cooling system before you bolted it in. Do that part right and either cooler will serve you.
Shop 6.0 Power Stroke diesel parts at coredieselparts.com. Free shipping over $70, ships fast.
Related guides: - 6.0 Power Stroke Oil Cooler Failure and Replacement Guide - 6.0 Power Stroke EGR Cooler Failure: Symptoms, Causes, and the Fix