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Cummins Coolant Filters
Fleetguard WF2126 Coolant Filter, Cross-Reference to Cummins 3680433
Fleetguard WF2126 coolant filter is the Fleetguard number for Cummins 3680433, a spin-on coolant element used on select Cummins ISX, ISM, and ISL/QSL engine builds. It is listed as a chemical coolant filter: it filters the coolant and releases a supplemental coolant additive, rather than filtering only. Whether it is the right filter for your engine depends on the engine build, the coolant type, and the thread form, not on the number alone.
- Part number
- WF2126
- Type
- Spin-on chemical coolant filter
- OEM cross-reference
- Cummins 3680433 (also 3100310, 3680315, 4907485; build-dependent)
- Thread form
- M36 x 2.0
Availability and delivery terms confirmed with quotation.
What WF2126 is and what to confirm
WF2126 is a spin-on coolant filter for select Cummins builds. It is listed as a chemical element; the Baldwin interchange BW5086 is a BTA Plus filter that releases a controlled dose of supplemental coolant additive to protect the cylinder liners, rather than a blank, filtration-only element. Fleetguard is a filter brand, not ours; WF2126 is a reference point, not a fitment statement.
This page is not a stock list or a fitment certificate. It sets out what WF2126 is, where listings mislead, and how to confirm the number before you order. Cummins coolant filters are covered as a category here.
Same filter, several OEM numbers
WF2126 and Cummins 3680433 describe the same spin-on coolant filter; the OEM number also appears as 3100310, 3680315, and 4907485, build-dependent.
Chemical, not blank
WF2126 is a chemical (additive) coolant filter, not a blank element; the two are not interchangeable.
Thread does not confirm chemistry
Thread form is M36 x 2.0; a thread match does not confirm the chemistry.
Confirm before ordering
Confirm the engine serial, the coolant type, and the number off the removed filter before ordering.
WF2126 Specifications
Manufacturer-published specifications for the WF2126 / BW5086 interchange include an M36 x 2.0 thread, roughly 137 mm overall height, about 94 mm outside diameter, and a BTA Plus additive charge. These figures are the manufacturer’s data; confirm them against the manufacturer’s own product record for your build.
| Check | Published value | How to confirm |
|---|---|---|
| Thread | M36 x 2.0 | Match the old element |
| Overall height | Roughly 137 mm | Confirm against the manufacturer record |
| Outside diameter | About 94 mm | Confirm against the manufacturer record |
| Additive charge | BTA Plus | Confirm coolant type and chemistry |
| Engine-maker number | 3680433 (also 3100310, 3680315, 4907485) | Check the build record and engine serial |
Swipe horizontally to view all columns.
WF2126 Cross-References
| Brand | Candidate reference |
|---|---|
| Cummins | 3680433 (also 3100310, 3680315, 4907485) |
| Fleetguard | WF2126 |
| Baldwin | BW5086 (BTA Plus) |
| Donaldson | P554073, P550866 |
| Luber-Finer | LFW2126 |
| Mann-Filter | WA 956/3 |
| FRAM | PR8693 |
A cross-reference is a candidate to review, not proof of fitment, and on a coolant filter, not proof of the correct additive dose. Two numbers can share a reference and still differ in thread, media, or additive charge. Search by number or engine model in the filter lookup.
Applications & ordering
Which engines use WF2126, and where listings mislead
Select Cummins ISX, ISM, and ISL/QSL builds
WF2126 appears on select Cummins builds, including ISX, ISM, and ISL/QSL; dealer listings tie it to the Cummins ISL. The list is build-dependent: the same model designation can carry different elements across production years.
- The OEM number varies. WF2126 resolves to more than one Cummins number, 3680433 most often, but also 3100310, 3680315, and 4907485. A listing that names only one hides a build or supersession question. Confirm against the engine serial.
- It is a chemical filter, not a blank. WF2126 releases a supplemental coolant additive (BTA on the interchange). On a fully formulated / extended-life coolant, a chemical filter can over-dose the system. Confirm the coolant type before ordering.
- The thread form is a separate check. WF2126 uses an M36 x 2.0 thread; other common Cummins coolant filters use 11/16-16. A reference that matches the outside diameter but not the thread is a wrong filter.
How to confirm WF2126 before you order
- Record the engine maker, model, and full serial or build (CPL) number.
- Note the coolant type: conventional needing supplemental additive, or fully formulated / extended-life.
- Read the complete number off the removed filter, and check the thread form (M36 x 2.0).
- State the quantity and whether a genuine original item is required.
Where two records disagree, send both; the difference usually points to a supersession, a build variation, or an element fitted to the wrong specification. Numbers can be checked by engine serial on Quickserve; the full sequence is in how to identify the correct engine filter. Every offered item is checked before quoting; see quality control and verification.
Request a coolant filter quoteFrequently Asked Questions
Is WF2126 the same as Cummins 3680433?
Yes. WF2126 is the Fleetguard number for Cummins 3680433, a spin-on coolant filter. The same element also appears under other Cummins numbers, 3100310, 3680315, and 4907485, so confirm against the engine serial rather than a single listing.
What engines does the WF2126 coolant filter fit?
It appears on select Cummins builds including ISX, ISM, and ISL/QSL; dealer listings tie it to the ISL. Fitment is build-dependent, so confirm against the engine serial rather than the model name.
Is WF2126 a chemical or blank coolant filter?
It is listed as a chemical coolant filter: it releases a supplemental coolant additive (BTA on the interchange) rather than filtering only. Confirm against the coolant type; a chemical filter can over-dose a fully formulated / extended-life system.
What is the Baldwin equivalent of WF2126?
Baldwin lists BW5086, a BTA Plus coolant filter, as the interchange for WF2126. Treat it as a candidate to review, not a confirmation of fitment or of the correct dose.
What thread does WF2126 use?
The published interchange lists an M36 x 2.0 thread. Other Cummins coolant filters use a different thread (11/16-16), so confirm the thread form as well as the number before ordering.
Confirm the number before you order.
WF2126 is a reference that gets you to a candidate coolant filter, not a guarantee of fitment or of the correct additive dose. Send the engine serial, the coolant type, the complete number off the old filter, and the thread form; we will confirm the offered item, its maker, its complete number, its additive charge where applicable, and the delivery terms before you commit.