🚛 CAT C7 — 7.2L

CAT's official parts catalog lists the 1R-1808 as compatible with C7, C9, C11, C13 and C15 truck engines, among many other CAT applications.

🚛 CAT C9 — 8.8L

Common applications: Freightliner, Peterbilt, Kenworth and other trucks equipped with the Caterpillar C9.

🚛 CAT C10 / C11

The CAT 1R-1808 is listed by Caterpillar for C11 applications.

🚛 CAT C12 — 12.0L

CAT specifically lists the 1R-1808 as compatible with the C-12 truck engine.

🚛 CAT C13 — 12.5L

The 1R-1808 is officially listed for C13 truck engines by Caterpillar.

🚛 CAT C15 — 14.6L

Caterpillar's official catalog lists 1R-1808 for C15 truck engines.

🚜 CAT 3116 / 3126

*Verify the filter base/thread and exact application before substituting. Caterpillar identifies 1R-0739 as an oil filter used on 3116 and 3304/3306 applications and identifies 1R-1807 as the advanced-efficiency counterpart.

🛢️ Common CAT Oil Filter Cross References

Important: There are conflicting aftermarket cross-reference databases for some CAT numbers, particularly 1R-1808. Caterpillar itself confirms that 1R-1808 fits numerous truck-engine applications, including C7, C9, C11, C12, C13 and C15, but aftermarket catalogs can assign different equivalent filter numbers.

⛽ Common CAT Fuel Filters

Caterpillar identifies 1R-0750 as an advanced-efficiency secondary fuel filter and lists C9, 3306, 3208 and 3116 among its compatible truck-engine applications.

💧 CAT Coolant Filters

Coolant filters are more application-specific than oil filters, so I would not put a generic coolant filter against an engine family without checking the cooling-system configuration.

For the website, I'd structure this section as:

That is preferable to publishing questionable coolant cross-references and having a customer order the wrong filter.

🔎 Find Your CAT Filter by Engine

CAT C7

Oil: 1R-1808
Fuel: 1R-0751
Fuel/Water Separator: 326-1644

CAT C9

Oil: 1R-1808
Fuel: 1R-0751
Fuel/Water Separator: 326-1644

CAT C12

Oil: 1R-1808
Fuel: 1R-0750 / 1R-0749
Fuel/Water Separator: 326-1644

CAT C13

Oil: 1R-1808
Fuel: 1R-0749 / 1R-0762
Air: 3I-1456 / 246-5009

CAT C15

Oil: 1R-1808
Fuel: 1R-0749 / 1R-0762
Air: 3I-1456 / 246-5009

CAT 3116 / 3126

Oil: 1R-0739 / 1R-1807
Fuel: 1R-0751

⚠️ Important Fitment Notice

Cross-reference numbers are provided for reference only. Caterpillar applications can vary by engine serial number, engine arrangement, year, emissions configuration, filter base and equipment configuration. Caterpillar itself warns that changes to the manufacturer's configuration can affect fitment.

Always verify the CAT part number, engine model and serial number before ordering.

Need help finding your CAT filter?

Send Hawhee Truck Repair your:

• CAT engine model
• Engine serial number
• Current filter number
• Truck/equipment year and model

We'll help identify the correct filter.