Two filtration stages
Full-flow oil filters clean nearly all oil leaving the pump. Bypass filters sample a smaller flow and polish finer particles — a configuration used on some Volvo D11–D13 and related Mack platforms.
Full-flow
Examples: 23151592 (standard) and 23658092 (long-life). This is the primary engine protection filter.
Bypass
Example: 21707132. It is not a substitute for the full-flow filter; it works with it.
Service tip
Replace both when the OEM interval calls for a full oil service. Verify the required parts for your engine before ordering.
Frequently Asked Questions
Can I skip the bypass filter?
If your engine is designed for two-stage filtration, skipping bypass filtration can increase soot and fine-particle load over long drains. Follow the OEM service design.
Are long-life and standard full-flow filters the same?
Not always. Long-life elements such as 23658092 are built for extended drains. Use the media type your oil drain interval requires.
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.