Caterpillar ECF-3 engine oil: what the spec covers and which grades meet it
ECF-3 is Caterpillar's highest Engine Crankcase Fluid specification for commercial diesel engine oils, defined by the API CJ-4 performance requirements.[1]
TotalEnergies' data sheets say Rubia Works 4000 15W-40, 5000 10W-40 and 5000 FE 5W-30 meet ECF-3. Caterpillar does not approve or verify ECF-3 claims, so check the oil and SAE grade your engine's manual names.[2][3][4][5]
Published · Updated · How did we check this? · Pack sizes and prices
Approval status at a glance
Four status levels: OEM-approved (OEM list); TotalEnergies-reported suitable; Meets stated performance (TotalEnergies claim); Confirm in your equipment manual. Where sources disagree we show the weaker one.
RUBIA WORKS 4000 15W-40 SAE 15W-40 · Caterpillar ECF-3
Meets stated performance (TotalEnergies claim)
Wording: “Meets Caterpillar ECF-3/ECF-2/ECF-1-a”
Source: TotalEnergies data sheet, last updated Jul 2026; TotalEnergies product list supplied to Bulk Lubricants Australia, Oct 2026
RUBIA WORKS 5000 10W-40 SAE 10W-40 · Caterpillar ECF-3
Meets stated performance (TotalEnergies claim)
Wording: “Meets Caterpillar ECF-3/ECF-2/ECF-1-a”
Source: TotalEnergies data sheet, last updated Jan 2025; TotalEnergies product list supplied to Bulk Lubricants Australia, Oct 2026
RUBIA WORKS 5000 FE 5W-30 SAE 5W-30 · Caterpillar ECF-3
Meets stated performance (TotalEnergies claim)
Wording: “Meets Caterpillar ECF-3/ECF-2/ECF-1-a”
Source: TotalEnergies data sheet, last updated Sep 2023; TotalEnergies product list supplied to Bulk Lubricants Australia, Oct 2026
What is Caterpillar ECF-3?
Caterpillar developed its ECF specifications to ensure minimum acceptable performance from commercial diesel engine oils. They require more engine tests than the matching API categories, and each step up gives more performance: ECF-3 is above ECF-2 and well above ECF-1-a.[1]
Is any oil 'Caterpillar approved' for ECF-3?
Caterpillar says it will not monitor or verify claims of ECF-3 compliance; each oil supplier is responsible for its own product. That is why the grades on this page are shown as meeting ECF-3, never as approved.[5]
How does ECF-3 compare with API CK-4 and FA-4?
Caterpillar did not write an ECF specification for API CK-4. It accepts commercial oils that are API CK-4 licensed and/or meet ECF-1-a, ECF-2 or ECF-3 as second choice in Cat diesel engines, after Cat oils. API FA-4 oils are not allowed in Cat engines.[1]
| Oil category | Caterpillar's position for Cat diesel engines |
|---|---|
| Cat engine oils | First choice |
| Commercial oil meeting ECF-3 (defined by API CJ-4 performance) | Acceptable, second choice |
| Commercial oil that is API CK-4 licensed | Acceptable, second choice (no ECF spec for CK-4) |
| API FA-4 | Not allowed |
Does an ECF-3 oil suit every Tier 4 or Stage V engine?
Don't assume so. Caterpillar says engines with aftertreatment devices, including those certified to US EPA Tier 4 Nonroad and EU Stage IIIB, IV and V, need specially formulated oils. The engine's own manual sets the exact oil and viscosity.[1]
ECF-3 is one of Caterpillar's requirements. A non-Cat engine, or a Cat engine whose manual names something else, may need a different spec or SAE grade.(our interpretation)
TotalEnergies recommends Rubia Works 4000 15W-40 for engines with exhaust after-treatment systems, and says Rubia Works 5000 10W-40 and 5000 FE 5W-30 are especially suited to earthmoving, quarrying and construction engines.[2][3][4]
How do I choose between the three Rubia Works grades?
Start with the SAE viscosity grade your manual lists for your temperature range (15W-40, 10W-40 or 5W-30). Then check any other approvals your fleet needs on the data sheet.(our interpretation)
- For mixed fleets, the data sheets also carry Cummins, Volvo and Mercedes-Benz approvals; see the Cummins and Volvo approvals guide and the Mercedes-Benz 228.31 / 228.51 guide.(our interpretation)
Supply
Pack sizes and prices from Bulk Lubricants Australia
All three grades are TotalEnergies' 'meets ECF-3' claims. The right one is the viscosity grade your engine manual names.(our interpretation) Rubia Works 4000 15W-40 comes in drums; Rubia Works 5000 10W-40 and Rubia Works 5000 FE 5W-30 come in 20 L packs and drums. Each is quoted per order, for collection from Maddington (Perth) or freight Australia-wide. Status details are in the panel above.
RUBIA WORKS 4000 15W-40 SAE 15W-40
- Caterpillar ECF-3: Meets stated performance (TotalEnergies claim)
Pack sizes: Drum
Request a price for RUBIA WORKS 4000 15W-40 SAE 15W-40RUBIA WORKS 5000 10W-40 SAE 10W-40
- Caterpillar ECF-3: Meets stated performance (TotalEnergies claim)
Pack sizes: 20L, Drum
Request a price for RUBIA WORKS 5000 10W-40 SAE 10W-40RUBIA WORKS 5000 FE 5W-30 SAE 5W-30
- Caterpillar ECF-3: Meets stated performance (TotalEnergies claim)
Pack sizes: 20L, Drum
Request a price for RUBIA WORKS 5000 FE 5W-30 SAE 5W-30How did we check this?
On 24 Oct 2026 we read Caterpillar's Machine Fluids Recommendations (SEBU6250-32) and its ECF-3 specification. We then compared each Rubia Works data sheet with the TotalEnergies product list supplied to us. Where sources differ, this page uses the weaker wording.
Found an error or a newer list? Email quotes@bulklubricants.com.au with the source and we’ll review this page.
Where does this information come from?
- Caterpillar: Machine Fluids Recommendations, SEBU6250-32 (PDF)
- TotalEnergies data sheet: Rubia Works 4000 15W-40, last updated Jul 2026 (PDF)
- TotalEnergies data sheet: Rubia Works 5000 10W-40, last updated Jan 2025 (PDF)
- TotalEnergies data sheet: Rubia Works 5000 FE 5W-30, last updated Sep 2023 (PDF)
- Caterpillar: ECF-3 specification (PDF)
- TotalEnergies product list supplied to Bulk Lubricants Australia, Oct 2026 (not public)