Dorman Oil Reservoir Gasket replacement for Ford E/F Super Duty & Excursion — 635-128 durable oil‑resistant seal

The Dorman 635-128 oil reservoir gasket is a direct-fit replacement gasket engineered to restore sealing performance and durability on compatible Ford, International, IC and related vehicle applications.

This replacement oil reservoir gasket matches the original equipment's shape and mounting points so you can return the reservoir to leak-free service. Manufactured from durable materials and backed by Dorman's product expertise, the 635-128 is intended for fleet, commercial and heavy-duty vehicle maintenance where reliable sealing and long service life matter.

What vehicles will this gasket fit?

This gasket is designed for a wide range of Ford E-series, F-series Super Duty, Excursion, Econoline, and many International and IC bus and chassis models from the late 1990s through the early 2000s. Always verify fitment by entering your exact year, make, model and trim into the vehicle garage tool before ordering.

• Fits Ford E-350, E-450, E-550, F-250 through F-750 and Excursion model years listed.
• Compatible with multiple International 3000/3800/4700 series models and Genesis RE chassis.
• Includes IC Corporation bus and commercial models from 1996–2004 as noted in fitment list.
• Use the garage tool to confirm compatibility for your exact trim and drivetrain.

How does this gasket restore reservoir function?

The 635-128 gasket replaces a failed or worn seal to stop oil leaks and re-establish the proper mating surface between the reservoir and its mounting flange. Restoring a correct seal prevents oil loss and contamination ingress without modifying the original components.

• Recreates original gasket profile and bolt hole alignment for a snug fit.
• Stops leaks where the reservoir meets its housing, maintaining oil level integrity.
• Prevents dirt and moisture from entering the reservoir area, protecting internal parts.
• Eases installation with OEM-style fit, reducing the need for additional sealing compounds.

What are the construction and reliability features?

Dorman builds the 635-128 using materials selected for chemical resistance and long-term dimensional stability, so the gasket holds up to typical engine oil exposure and operating temperatures. The part is supported by Dorman’s U.S.-based product experts and years of aftermarket experience.

• Durable gasket compound engineered for oil resistance and thermal cycling.
• Manufactured to match the original fit and function for a dependable repair.
• Backed by Dorman technical support and quality standards from experienced teams.
• Intended for routine maintenance and repair in heavy-duty service conditions.

How should I confirm fit and install this part?

Before purchase, confirm vehicle compatibility using the site garage tool by entering year, make, model and trim. Installation is straightforward for a qualified technician—remove the old gasket, clean the mating surfaces thoroughly, and torque bolts to the manufacturer's specifications when fitting the new gasket.

• Verify vehicle fitment with the online garage lookup tool prior to ordering.
• Always clean mating surfaces to ensure a proper seal during installation.
• Follow factory torque specifications and bolt-up sequence to avoid distortion.
• Inspect the reservoir and flange for damage before installing the new gasket.

Who is this for? The Dorman 635-128 oil reservoir gasket is suited for fleet managers, independent repair shops and do-it-yourself technicians servicing late-1990s to early-2000s Ford trucks, vans, buses and International/IC chassis. It’s ideal when you need a reliable, OEM-style replacement to stop leaks and restore the reservoir’s sealing surface without expensive assemblies or custom modifications.