ACEA Oil Sequences vs. Brake Fluid
Comparing 2 standards across 11 specifications. 11 key differences identified.
The European Automobile Manufacturers’ Association (ACEA) Oil Sequences establish stringent oil performance specifications tailored to European driving conditions and exhaust aftertreatment devices. Dividing into A/B Sequences (High-SAPS for older passenger cars without particulate filters) and C Sequences (C2, C3, C5, C6 Low/Mid-SAPS for DPF diesel and GPF gasoline particulate filters).
DOT Brake Fluid (standardized under US FMVSS 116, SAE J1703/J1704, and ISO 4925) defines the hydraulic fluid specifications for automotive braking systems. Governing Dry Boiling Points (fresh fluid) and Wet Boiling Points (3.7% water contamination absorbed over time) across glycol-ether fluids (DOT 3, DOT 4, DOT 5.1) and silicone-based fluid (DOT 5).
Specification Comparison Table
11 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standardization
|
ACEA Oil Sequences (A/B for standard engines, C for catalyst-compatible, E for heavy-duty commercial diesel) | FMVSS 116 / SAE J1703 (DOT 3), SAE J1704 (DOT 4), ISO 4925 Class 3/4/6/7 |
|
SAPS Definition
|
Sulfated Ash, Phosphorus, and Sulfur additives (ZDP anti-wear agents and metallic detergents) | — |
|
ACEA A3/B4 (High SAPS)
|
High performance/stay-in-grade stable oil for high-revving European engines; HTHS ≥ 3.5 mPa·s (BMW LL-01, MB 229.5, VW 502.00) | — |
|
ACEA A5/B5 (High SAPS, Low Friction)
|
Low-viscosity fuel economy oil with HTHS 2.9 to 3.5 mPa·s (Ford WSS-M2C913-D, Volvo) | — |
|
ACEA C3 (Mid SAPS, High HTHS)
|
The European DPF/GPF gold standard: HTHS ≥ 3.5 mPa·s, Sulfated Ash ≤ 0.8% (BMW LL-04, MB 229.51/229.52, VW 504.00/507.00, Porsche C30) | — |
|
ACEA C5 & C6 (Low SAPS, Low HTHS)
|
Ultra-low viscosity (0W-20) for modern fuel economy: HTHS 2.6 to 2.9 mPa·s with LSPI protection (BMW LL-17 FE+, VW 508.00/509.00) | — |
|
DOT 3 Minimum Boiling Points
|
— | Dry: 205°C (401°F) | Wet (3.7% H₂O): 140°C (284°F) — Standard domestic vehicles |
|
DOT 4 Minimum Boiling Points
|
— | Dry: 230°C (446°F) | Wet: 155°C (311°F) — Modern European and Japanese passenger cars with ABS/ESP |
|
DOT 4 Class 6 (Low Viscosity)
|
— | Low viscosity at -40°C (max 750 mm²/s vs 1500 mm²/s standard) for rapid ABS/ESP active brake pulsing in freezing winters |
|
DOT 5.1 (High Performance Glycol)
|
— | Dry: 260°C (500°F) | Wet: 180°C (356°F) — Glycol-ether base compatible with DOT 3 and DOT 4 systems |
|
DOT 5 (Silicone-Based — Purple)
|
— | Dry: 260°C (500°F) | Hydrophobic silicone base (NEVER mix with DOT 3/4/5.1; used in classic cars and military Harley-Davidsons) |