Nice info on the 2.7!!!

[danmoochie]

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[Jason B]

Everybody mentions the 'rubber' oil pump belt, but nobody presents data on failures.
Could it be there are none, or very few?

 

[danmoochie]

Everybody mentions the 'rubber' oil pump belt, but nobody presents data on failures.
Could it be there are none, or very few?

Its the same belt as the 5.0 LOL... plus it's been updated, so I think most the fear is on prior models.

 

[WWilli]

Probably not an issue at all but It just doesn't make sense why Ford would put so much into this engine compared to their others and then do a wet belt...Ive heard one reason is to prevent engine vibrations from transferring to the oil pump which is a high horsepower point of failure on the Coyote.. Who knows, ? I just try not to think about it and enjoy my glorious 2.7

 

[kingpin98]

My understanding is that the coyote has it in the f150 but not the mustang, not sure on that though. Lots of other engines use that style of belt too. Does not seem to be a major problem as the 2.7 has been out for a long time in the f150.

 

[Cosmicjumperalex03]

As a delaer shop foreman I have never seen a 2.7L oil pump belt fail.... ever.....

 

[Stu x 4]

2.7L, its zippy and a joy to drive.

 

[hand-filer]

2.7L, its zippy and a joy to drive.

 

[Lion77]

I did a search over on the 3.0L oil pump belt thread for Raptors and listed a bunch of F-150s for sale with anywhere from 210k to 280k miles with original engines. I saw one of Facebook of a 2.7L F-150 with almost 500k miles as a fleet vehicle.

The 2.7L, 3.0L and 2021+ 5.0L on F-150s all have a belt driven oil pump. Its a low stress application and the only significant issues Ford has had with wet belts is wet timing belts in the 1.0L and 1.6L ecoboost 4-cyl. where they would typically fail right around 150k (which is the stated service interval for timing).

Now that was a stupid design and bit of a fiasco becuase valve train is much higher stress than oil pump (low load). Even with a 4 cylinder its constantly driving 16 valves at several hundred pounds of combined force. Oil pump is miniscule compared to that which is why its not an issue there.

Honda has been using belts in small gas engines since early 2k. Saw someone take apart a 2004 lawnmower engine with belt driven SOHC and the belt looked immaculate at 20 years old lol. Its not new, maybe for Ford with oil pumps.

My only recommended precaution is use Ford spec oil to ensure belt compatability. I just run MC full synthetic and change myself, get it from Rock Auto and it will run you about $63 for 7qts + Filter, and its their latest GF-7A spec too as they just switched over from GF-6 spec for improved LSPI prevention, reduced timing chain wear and 33% reduction in cold cranking viscosity.

 

[josephp732]

Oil and our 2.7l EB's. There’s been a lot of discussion about different synthetic oils and the wet oil-pump belt in the 2.7L EcoBoost engines.

The belt isn’t ordinary rubber — it’s a reinforced elastomer specifically designed for constant oil immersion — but it’s still a wear item and oil chemistry matters to some extent.

Ester-based oils (Group V synthetics - like Red Line) are excellent lubricants with strong film strength and thermal stability, but they’re more chemically active than typical PAO/Group III synthetics (Amsoil). The concern isn’t that they automatically damage the belt — it’s that Ford validated belt durability primarily using oils that meet their specific specs (API SP and Ford WSS approvals). Heavy ester formulations without those approvals just haven’t been tested as extensively with that belt material.

Real-world takeaway:

• Oils meeting Ford spec are the safest choice for long belt life.
• Ester-rich boutique oils probably won’t cause immediate problems, but they add uncertainty without clear benefit for this engine.
• Regular oil changes matter more than exotic base stocks for wet-belt longevity.

Sticking with a Ford-approved full synthetic is the lowest-risk approach for these engines.

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