Choosing the correct oil, knowing the expected refill quantity and installing the correct oil filter are fundamental parts of Caterpillar marine diesel maintenance. This Caterpillar marine engine oil type and capacity chart covers popular CAT 3208, 3116, 3126, 3406, C7, C9, C12, C15, C18 and C32 engines, while our Marine Diesel Troubleshooting Guide can help diagnose low oil pressure, excessive oil consumption, blue smoke, overheating and other marine diesel problems.
Caterpillar Marine Engine Oil Type & Capacity Chart
Oil capacities, genuine CAT oil-filter numbers and lubricant recommendations for common Caterpillar marine diesel engines.
Caterpillar Marine Oil Capacity & Filter Chart
| Caterpillar Engine | Standard Oil Capacity | Standard CAT Oil Filter | Recommended Oil |
|---|---|---|---|
| CAT 3208 | Approx. 16 qt / 15.1 L* | CAT 1R-0713 | CAT diesel engine oil / suitable Chevron Delo or Shell Rotella — commonly 15W-40 where specified |
| CAT 3116 Marine | Approx. 30 qt / 28 L* | CAT 1R-1807 | CAT SAEO SAE 30 or SAE 40 on applicable MUI marine engines |
| CAT 3126 Marine | Approx. 30 qt / 28 L* | CAT 1R-1807 | CAT SAEO on applicable MUI engines; electronic engines require configuration-specific verification |
| CAT 3406C | Approx. 9 gal / 34 L | CAT 1R-1808 | CAT DEO / DEO-ULS / suitable Delo or Rotella meeting required specification |
| CAT 3406E | 13 gal / 52 qt / 49 L | CAT 1R-1808 | CAT DEO / suitable 10W-30 or 15W-40 equivalent where specified |
| CAT C7 | Approx. 24 qt / 22.7 L* | CAT 1R-1807 | CAT diesel engine oil / suitable Delo or Rotella meeting required specification |
| CAT C9 | Approx. 29 qt / 27.5 L* | CAT 1R-1808 | CAT DEO / suitable Delo or Rotella meeting required specification |
| CAT C12 | Approx. 7.5 gal / 28 L* | CAT 1R-1808 | CAT DEO / DEO-ULS / suitable Delo or Rotella meeting required specification |
| CAT C15 | Approx. 10 gal / 38 L* | CAT 1R-1808 | CAT DEO / DEO-ULS / suitable Delo or Rotella meeting required specification |
| CAT C18 | 13 gal / 52 qt / 49 L | CAT 1R-1808 | CAT DEO / DEO-ULS / suitable approved equivalent |
| CAT C32 | Approx. 26 gal / 99 L* | CAT 1R-1808* | CAT DEO / DEO-ULS / approved equivalent — verify generation |
3116 / 3126 MUI OIL WARNING:
Do not automatically use ordinary 15W-40 in every Caterpillar 3116 or 3126 marine engine. Caterpillar developed Special Application Engine Oil — SAEO SAE 30 and SAE 40 — for applicable mechanically unit-injected 3116 and 3126 marine engines. Identify the exact engine configuration before selecting the lubricant.
What Oil Should You Use in a Caterpillar Marine Diesel?
CAT diesel engine oil is the straightforward OEM choice. Chevron Delo and Shell Rotella can also be suitable when the exact product meets Caterpillar’s required viscosity and diesel-oil specification.
The brand name itself is not enough. Delo and Rotella each include several formulations, and the oil selected should match the Caterpillar engine generation, operating temperature and required performance specification.
For genuine filter information, Caterpillar lists CAT 1R-0713 for 3208 applications and CAT 1R-1807 across applicable 3116, 3126 and C7 engines.
Caterpillar Advanced Marine Engine White Filters
Caterpillar offers genuine white marine filters for yacht and premium engine-room installations. They provide the clean white appearance often preferred in finished yacht engine rooms while retaining Caterpillar filtration engineering.
For the common Advanced Efficiency oil-filter application used on many larger Caterpillar engines, Caterpillar identifies the white and yellow versions as corresponding filter applications:
White CAT Oil Filter
Yellow CAT Oil Filter
The white version can therefore be useful on Caterpillar-powered yachts where appearance matters without moving to an unknown aftermarket filter. Caterpillar provides additional information in its CAT Marine White Filters reference.
The standard yellow CAT 1R-1808 Advanced Efficiency oil filter is used across numerous Caterpillar engine applications.
CAT 3208
The Caterpillar 3208 remains common in older sportfishers, cruisers, motor yachts and commercial vessels. Naturally aspirated, turbocharged and aftercooled configurations were produced.
A common service quantity is approximately 15 liters. CAT 1R-0713 is a genuine Caterpillar oil-filter application for the 3208 family.
CAT 3116
The 3116 marine engine requires particular attention to lubricant specification. Applicable MUI engines use Caterpillar’s SAEO recommendation rather than simply following a generic heavy-duty diesel oil rule.
A common lubrication-system quantity is approximately 28 liters, while CAT 1R-1807 is a familiar filter application.
CAT 3126
The 3126 was produced in both mechanical and electronically controlled configurations. Identifying which engine is installed matters when selecting the correct oil.
A common marine service reference is approximately 28 liters, with CAT 1R-1807 used on applicable configurations.
CAT 3406C
The mechanical 3406C remains in service in larger cruising and commercial vessels. A common marine refill reference is approximately 34 liters or about 9 U.S. gallons.
CAT 1R-1808 is commonly associated with this larger Caterpillar engine family.
CAT 3406E
A common standard marine 3406E configuration uses approximately 49 liters or 13 U.S. gallons of lubricating oil.
Different pan configurations exist, so the final fill should always be established by the actual engine installation.
CAT C7
The C7 appears in numerous recreational and commercial marine installations. A common configuration is approximately 22.7 liters.
CAT 1R-1807 is used across applicable C7 applications, although newer C7.1 engines should not automatically be treated as identical.
CAT C9
The Caterpillar C9 was offered with different pan and propulsion arrangements. A common reference is approximately 27.5 liters.
Many C9 applications use CAT 1R-1808 Advanced Efficiency filtration.
CAT C12
The C12 remains popular in offshore cruisers, sportfishing boats and commercial vessels. A common marine reference is approximately 28 liters.
Correct oil level and regular oil analysis become especially valuable on higher-hour C12 installations.
CAT C15
The C15 was produced with multiple lubrication-system arrangements. A common standard reference is approximately 38 liters, although larger arrangements exist.
CAT 1R-1808 is widely associated with large Caterpillar engine applications.
CAT C18
A documented shallow-pan C18 marine configuration uses approximately 49 liters or 13 U.S. gallons.
The C18 is commonly found in larger yachts, sportfishers and demanding commercial applications where oil condition and cooling-system maintenance are especially important.
CAT C32
The C32 has been produced in multiple generations and lubrication configurations. Older engines can use considerably different quantities than later C32B propulsion engines.
For this engine in particular, use the serial number and actual sump configuration rather than relying solely on the model name.
Need Caterpillar Marine Diesel Service?
805 Marine Diesel Mechanic provides Caterpillar diagnostics, oil and filter service, cooling-system maintenance, fuel-system troubleshooting and marine engine surveys throughout Ventura, Oxnard, Channel Islands Harbor and Santa Barbara.
Why Caterpillar Oil Filters Matter
Fine abrasive particles circulating through engine oil can accelerate wear on bearings, journals, turbocharger components and other lubricated surfaces. The correct filter is therefore an important part of the lubrication system rather than simply a disposable container.
Caterpillar describes its Advanced Efficiency filters as engineered to provide high-efficiency contamination control while maintaining the flow and structural requirements expected by the engine.
Using the proper genuine filter also helps ensure the correct sealing arrangement, filter capacity and bypass characteristics for the intended Caterpillar application.
Oil Capacity Means More Than the Number in the Chart
A published quantity may represent oil-pan capacity, refill capacity or the complete system with new filters. Those numbers are not always interchangeable.
Filter size, number of filters, remote filtration and oil-pan depth can all change how much oil is required after servicing.
Do Not Pour the Entire Quantity In at Once
After draining the engine and replacing the filters, initially fill slightly below the expected capacity. Start the engine, confirm oil pressure immediately and inspect the filters, drain system and hoses for leakage.
Shut the engine down, allow adequate drain-back time and then establish the final level using the calibrated dipstick.
Why the Engine Serial Number Matters
Caterpillar engines sharing the same basic model designation can use different arrangements. The engine serial number identifies the actual build and should be used when confirming filters, capacities and service information.
Caterpillar Oil Analysis
Oil analysis can reveal internal engine-condition information that may not be visible during routine maintenance. Laboratory testing can identify unusual wear metals, fuel dilution, coolant contamination, soot and changes in lubricant condition.
The greatest value comes from trending results over time. A developing change from an engine’s established baseline can be more meaningful than a single isolated result.
Oil analysis is also valuable during our Caterpillar Marine Engine Surveys, where lubrication findings can be compared with cooling-system condition, diagnostics and sea-trial performance.
Caterpillar Preventive Maintenance
Changing engine oil and filters is only one part of proper Caterpillar marine maintenance. Raw-water pumps, heat exchangers, aftercoolers, fuel filtration, belts, hoses, coolant, valve adjustments and turbocharger condition all affect long-term reliability.
For a broader maintenance reference, see our Caterpillar Marine Engine Maintenance Schedule.
Caterpillar Oil & Filter References
CAT engine oil: Caterpillar provides CAT DEO-ULS SAE 15W-40 for applicable engines. Engine-specific operating and maintenance information should always determine the final oil specification.
Filter selection: Use the Caterpillar engine serial number whenever confirming a genuine filter application, especially when dealing with older engines, repowers or alternate filter arrangements.
Caterpillar Marine Diesel Mechanic
Oil & Filter Service • Diagnostics • Cooling Systems • Fuel Systems • Turbochargers • Aftercoolers • Engine Surveys
Ventura • Oxnard • Channel Islands Harbor • Santa Barbara
Caterpillar Marine Engine Oil FAQ
Oil capacities, CAT oil filters, DEO, SAEO and Caterpillar Advanced white marine filter questions.
What oil should I use in a Caterpillar marine diesel?
CAT diesel engine oil is the OEM choice, while suitable Chevron Delo and Shell Rotella products can also be appropriate when they meet the viscosity and performance requirements of the engine. Always verify the recommendation for the exact Caterpillar model and serial number.
Can I use Chevron Delo in a Caterpillar marine engine?
Yes, when the particular Delo formulation meets the required Caterpillar oil specification and viscosity. Do not assume every Delo product is interchangeable.
Can I use Shell Rotella in a Caterpillar marine diesel?
Yes, an appropriate Rotella formulation can be suitable when it meets the Caterpillar-required viscosity and performance specification. Verify the actual product specifications before use.
Does every Caterpillar marine engine use 15W-40?
No. Many Caterpillar engines commonly use 15W-40, but oil requirements vary by engine generation, operating temperature and application. Applicable 3116 and 3126 MUI marine engines are important exceptions.
What oil does a CAT 3116 marine engine use?
Applicable mechanically unit-injected CAT 3116 marine engines have Caterpillar SAEO recommendations including SAE 30 and SAE 40. Identify the exact engine configuration before substituting another lubricant.
What oil does a CAT 3126 marine engine use?
The correct oil depends on whether the 3126 is an applicable MUI or electronic configuration. Caterpillar developed SAEO specifically for certain 3116 and 3126 MUI marine applications.
How much oil does a CAT 3208 hold?
A common CAT 3208 marine service quantity is approximately 15.1 liters or 16 U.S. quarts. Oil-pan arrangements vary, so use the dipstick and serial-number-specific information for the final level.
What oil filter does a CAT 3208 use?
CAT 1R-0713 is a common genuine Caterpillar oil-filter application for the 3208 engine family. Verify the serial number before ordering.
What oil filter does a CAT 3116 use?
CAT 1R-1807 is an Advanced Efficiency oil-filter application associated with the Caterpillar 3116. Check the engine serial number for final fitment.
What oil filter does a CAT 3126 use?
CAT 1R-1807 is a common Advanced Efficiency oil-filter application for the Caterpillar 3126 family. Individual configurations should still be verified.
What is CAT oil filter 1R-1808?
CAT 1R-1808 is an Advanced Efficiency Caterpillar engine oil filter used across numerous larger CAT engine applications. It is commonly encountered on engines such as the C9, C12, C15, C18 and other larger families.
What is the white CAT equivalent of 1R-1808?
Caterpillar identifies white oil filter 389-0434 as the corresponding white marine filter for yellow CAT 1R-1808. The white version is particularly useful in yacht engine rooms where appearance is important.
Why does Caterpillar offer white marine filters?
The white finish is designed to integrate visually with clean yacht and premium marine engine-room installations. They remain genuine Caterpillar filter applications rather than generic cosmetic replacements.
How much oil does a CAT 3406E hold?
A documented standard marine 3406E configuration uses approximately 49 liters or 13 U.S. gallons. Different oil-pan configurations also exist.
How much oil does a CAT C12 hold?
A common Caterpillar C12 marine reference is approximately 28 liters or about 7.5 U.S. gallons. Confirm the actual engine arrangement before final filling.
How much oil does a CAT C18 hold?
A documented shallow-pan Caterpillar C18 marine configuration uses approximately 49 liters or 13 U.S. gallons. Other oil-pan arrangements can hold more.
Why can two CAT engines of the same model have different oil capacities?
Different oil pans, engine arrangements, installation angles, filter systems and engine generations can change the total oil quantity. The serial number and calibrated dipstick should determine the final service level.
Should I pour the entire listed quantity into the engine at once?
No. Initially fill slightly below the expected capacity, run the engine to fill the oil filter, verify oil pressure and check for leaks. After shutdown and drain-back, bring the oil to the correct dipstick level.
Can overfilling a Caterpillar marine diesel cause problems?
Yes. Excessive oil can contribute to aeration, crankcase-pressure problems and oil carryover. More oil than the calibrated maximum level does not provide extra protection.
Is oil analysis useful on Caterpillar marine diesels?
Yes. Oil analysis can help identify wear metals, fuel dilution, soot, coolant contamination and lubricant deterioration. Results become particularly valuable when samples are trended over multiple services.
Caterpillar Marine Diesel Service
Oil & Filter Service • Diagnostics • Cooling Systems • Aftercoolers • Fuel Systems • Turbochargers • Marine Engine Surveys
Ventura • Oxnard • Channel Islands Harbor • Santa Barbara