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Cummins Filter Kits
Fleetguard MK12025 Maintenance Filter Kit
The Fleetguard MK12025 maintenance filter kit is a service kit listed for heavy-duty Cummins engines, bundling the oil, fuel and air elements plus seals for a scheduled service. No public listing names which engine family it serves or itemises what is inside, so the kit number alone cannot confirm it is yours.
- Part number
- MK12025
- Type
- Maintenance filter kit
- Engine reference
- Heavy-duty Cummins (unspecified)
Availability and delivery terms confirmed with quotation.
What the MK12025 Kit Is, and What the Number Does Not Tell You
A maintenance kit is one number that consolidates the oil, fuel and air elements plus seals for a scheduled service event. The value is the matched set: the components are chosen together for one engine build and one service interval.
A kit number does not prove the set suits a different build. Kit contents can be superseded, and a number that was correct for one build at one point may not match the build in front of you.
Engine build
Provide the engine maker, model and full serial or build number.
Kit record
Confirm the kit number as listed for that build, including any supersession.
Removed parts
Match the complete number printed on each filter you are replacing against the kit contents.
No Public Listing Names the MK12025 Engine Family
The listings describe the MK12025 as “for Cummins diesel engines” and nothing more. The word “heavy-duty” appears, but that is retail copy, not an application record. No public source ties the kit to ISX, ISL, QSX, QSB or the B-series. That absence is the first thing to confirm. The engine family decides the kit, so the number alone leaves you with a shortlist rather than an answer. Send the maker, model and full serial or build number, and the parts record for that build.
MK12025 Kit Contents: Read the Box Label, Not the Web Listing
No listing names the items inside the MK12025. The contents are printed on the physical kit: the box label carries a “Contains:” line that lists the individual element numbers, usually in the form LF (lube), FF or FS (fuel and water separation) and AF (air). We do not publish a contents list we cannot source. The element numbers are confirmed against the kit record and the box label when we quote, then stated line by line in the quotation. A copied web listing is not evidence.
| Check | What to look for | How to confirm |
|---|---|---|
| Engine Family | Unspecified in public listings | Check engine serial or nameplate |
| Kit Contents | Printed on physical box label | Read “Contains:” line on the box |
| Element Numbers | LF, FF/FS, AF formats | Match against kit record |
Swipe horizontally to view all columns.
MK12025 vs MK13017, and the ISX Kit You Should Not Confuse It With
MK13017 is the other Fleetguard kit in the same category, tied to the B4.5, B5.9, QSB4.5 and QSB5.9 platform. MK12025 is described as heavy-duty, but no listing states which family it serves. Treat the difference as something to confirm by build; if a supplier offers one in place of the other, ask which build each kit is recorded against.
Separately, a different Fleetguard kit is listed for ISX engines. That is its own number, not the MK12025. A buyer searching “Fleetguard maintenance kit” can land on an ISX kit and assume it is the MK12025. The numbers do not match, so do not let a seller swap one for the other on name alone.
Order the number you can evidence; accept a substitution only when the quotation names it.
Applications, and How an MK12025 Order Is Quoted
Start with the engine, not the vehicle.
Heavy-duty Cummins engines (unspecified)
Applications are engine-led. The kit is listed for heavy-duty Cummins engines in trucks, plant and generator sets, but the specific family is what the record must name. We check each line against the build and the kit record, then state the offered kit, its contents, makers, complete numbers, quantity and delivery terms. No real-time stock feed is published; availability is confirmed against your list.
Know exactly what is being quoted.
Each line is checked against the parts record and filter position. Your quotation states the offered item, maker, complete part number, quantity and delivery terms.
Availability is confirmed against your list. No real-time stock feed is published.
Request a QuoteFrequently Asked Questions
What engine does the Fleetguard MK12025 fit?
The kit is listed for heavy-duty Cummins engines, but no public listing names the family. Confirming the engine serial and the kit record is more reliable than the kit number alone.
What is in the MK12025 kit?
The generic listings say oil, fuel and air elements plus seals. The itemised numbers are printed on the physical box label, and are confirmed against the kit record when we quote.
Is the MK12025 the same as the MK13017?
No. MK13017 is tied to the B-series and QSB platform; MK12025 is described as heavy-duty but unspecified. Confirm which kit your build’s record calls for.
Is the MK12025 an ISX kit?
The ISX maintenance kit is a different Fleetguard number. Do not assume an ISX kit is the MK12025 without matching the numbers.
Will the MK12025 fit my Cummins engine?
Only the build and the kit record confirm that. Send the serial and the numbers off the parts you are replacing.
Confirm the Number, Then Confirm the Build
The Fleetguard MK12025 maintenance filter kit is quoted against a build and a kit record, in that order: the number finds a candidate kit, and the build and the box label decide. Send the engine model, build number, and the kit or part numbers you are replacing. We will confirm the contents line by line, with maker, complete number and delivery terms.