How the systems work together
Volvo VNL trucks with D11, D12, or D13 engines can use multiple filtration stages across oil, fuel, and air systems. Exact components vary with engine, build year, and installed fuel processor; use this as a reference when checking a part number.
Oil system
- Full-flow: 23151592 or long-life 23658092, depending on application
- Bypass: 21707132 on many D11–D13 builds
Fuel system
- Secondary fuel: 23920469; late-model 24137737 is listed for some 2024+ D13 / Mack MP8 applications
- Water separator: FS20313 or FS19764 depending on processor
Air system
- Common primary elements: 21715813 and AF26163M; AF26163M replaces 20411815 on many trucks
Confirm before ordering
These reference numbers do not by themselves confirm that a CORALFLY product fits a particular truck. Check the OEM number, engine, model year, and fuel processor. CORALFLY product pages display make compatibility only when that fitment is present in the catalog.
Frequently Asked Questions
Why does my Volvo use two oil filters?
Many Volvo diesels use a full-flow filter plus a bypass filter for finer polishing. Kits often pair 23151592 or 23658092 with bypass 21707132.
Does Mack share Volvo filter numbers?
Often yes on shared platforms (MP7/MP8 and D11/D13). Still verify the Mack OEM number before substituting.
This guide is general reference material. Its truck and part examples do not confirm that any CORALFLY catalog product fits your application; product fitment is shown only when explicitly listed on the product. Contact CORALFLY if you need help.