Description
Product Overview
The EC781 Billet Aluminum Oil Filter Cap is the permanent fix for the most common oil change headache on Ford 6.0L and 6.4L Powerstroke diesel engines. CNC-machined from a solid block of 6061-T6 aluminum with a precision 36mm hex, this cap replaces the failure-prone OEM plastic filter cap (3C3Z-6766-CA / 1840754C91) that cracks, warps, and rounds off during removal.
Key Features
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Solid Billet 6061-T6 Aluminum: CNC-machined from a single aluminum billet — not cast, not molded. Withstands infinite heat cycles without degradation.
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Precision 36mm Hex: Sharp, defined hex edges provide positive socket engagement. No slipping, no rounding — even on stubborn caps that have been overtightened.
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Anodized Finish: Black or silver anodized coating resists corrosion from oil, road salt, and diesel shop chemicals. Looks great and stays that way.
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Viton O-Ring Included: Upgraded Viton O-ring provides superior heat resistance (-20°F to 400°F) compared to the OEM Buna-N seal. Won't harden and leak over time.
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Exact OEM Dimensions: Same thread pitch, height, and sealing surface geometry as the factory cap. Compatible with ALL FL2016/PF2016 filter cartridges.
Compatibility
| Year |
Make |
Model |
Engine |
| 2003-2007 |
Ford |
F-250/F-350/F-450/F-550 Super Duty |
6.0L Powerstroke V8 |
| 2008-2010 |
Ford |
F-250/F-350/F-450/F-550 Super Duty |
6.4L Powerstroke V8 |
| 2003-2005 |
Ford |
Excursion |
6.0L Powerstroke V8 |
| 2003-2010 |
Ford |
E-350/E-450 Super Duty |
6.0L Powerstroke V8 |
Specifications
| Specification |
Value |
| Part Number |
FJ-CAP10-CK (Black) / FJ-CAP04-01-SI (Silver) |
| OE Cross Reference |
3C3Z-6766-CA, 1840754C91 |
| Material |
6061-T6 Billet Aluminum |
| Finish |
Anodized — Black or Silver |
| Socket Size |
36mm Hex |
| Torque Spec |
18-22 ft-lbs |
| Includes |
EC781 Cap + Viton O-Ring |
Why Upgrade?
Ask any 6.0L or 6.4L Powerstroke owner about their worst oil change experience, and 9 out of 10 will mention the plastic oil filter cap. It swells when hot, welds itself to the housing, then rounds off when you try to remove it. The EC781 billet cap ends this cycle. One purchase, permanent peace of mind. 12-month warranty.
Frequently Asked Questions
Q: Does this include the oil filter?
A: No. This listing is for the EC781 billet aluminum oil filter cap only. The FL2016 oil filter is sold separately. We also offer a combo kit (cap + filter) for convenience.
Q: How is this better than the OEM plastic cap?
A: The OEM cap is injection-molded plastic that becomes brittle from heat cycling. Common failures: (1) 36mm hex rounds off during removal, (2) cap warps and leaks oil, (3) tabs crack under torque. Our EC781 is solid 6061-T6 billet aluminum — machined, not molded. It won't crack, warp, or round off.
Q: What color options are available?
A: Available in black anodized and silver anodized finishes. Both offer the same corrosion resistance and durability. Choose based on your engine bay aesthetic preference.
Q: Can I use my existing FL2016 filter with this cap?
A: Yes. The EC781 cap is dimensionally identical to the OEM cap — it fits all FL2016 and PF2016 filter cartridges from any brand (Motorcraft, WIX, Baldwin, etc.).
