The engine oil standards established by the European Automobile Manufacturers' Association (ACEA, Association des Constructeurs Européens d'Automobiles) are among the most authoritative and stringent performance specifications in the global lubricant industry. Compared to American API standards, ACEA imposes higher performance testing requirements to accommodate the high RPMs, high power density, extended drain intervals, and strict environmental emissions standards (such as DPF/GPF particulate filters) typical of European engines.

The high entry threshold of ACEA standards is mainly determined by strict limits on three core technical indicators:

Measures oil film strength under high temperature ($150^\circ\text{C}$) and high shear stress. A higher HTHS value provides stronger wear protection under extreme operating conditions (e.g., $\ge 3.5\text{ mPa}\cdot\text{s}$), while a lower HTHS helps reduce operating resistance and improve fuel economy.

Traditional full-ash formulations with strong detergent and dispersant properties. However, combustion residues can easily clog exhaust aftertreatment systems (such as DPF/GPF) in China VI / Euro 6 models.

Specifically designed for modern engines equipped with exhaust catalysts and particulate filters to significantly reduce ash deposition.

ACEA standards require engine oils to maintain viscosity stability and resist degradation after prolonged high-temperature operation, supporting extended oil drain intervals of 15,000–30,000 km common in Europe.

The ACEA classification system divides engine oils into three main categories for different engine types and application scenarios:

Primarily suited for older model years without Diesel/Gasoline Particulate Filters (DPF/GPF) or high-performance vehicles without exhaust aftertreatment systems:

Classic high-performance, high-shear oil. $\text{HTHS} \ge 3.5\text{ mPa}\cdot\text{s}$, offering exceptional wear protection and detergent-dispersant capability. Widely used in older German and high-performance cars.

Fuel-economy engine oil. $\text{HTHS}$ ranges between $2.9 \sim 3.5\text{ mPa}\cdot\text{s}$, protecting the engine while reducing fuel consumption. Often used in American, Japanese, and certain French/Volvo models.

Designed for modern China VI / Euro 6 emission-compliant vehicles equipped with DPFs or GPFs:

The mainstream Mid-SAPS oil on the market. $\text{HTHS} \ge 3.5\text{ mPa}\cdot\text{s}$, balancing high oil film strength with aftertreatment protection. Standard requirement for modern German vehicles (BBA, VW Group, etc.).

Mid-SAPS fuel-economy oil. $\text{HTHS} \ge 2.9\text{ mPa}\cdot\text{s}$, offering good fuel efficiency and aftertreatment protection. Commonly used in French, Japanese, and some Korean diesel/gasoline vehicles.

Low-viscosity, Low-SAPS oil (e.g., 0W-20/5W-20). $\text{HTHS} \ge 2.6\text{ mPa}\cdot\text{s}$, targeting maximum fuel economy for the latest low-emission, high-efficiency engines.

The newest low-viscosity standard. Builds on C5 by adding Low-Speed Pre-Ignition (LSPI) protection, timing chain wear protection, and turbocharger deposit control tests.

High-SAPS, long-drain heavy-duty diesel oils suited for Euro 3, Euro 4, Euro 5, and DPF-less heavy equipment.

Low/Mid-SAPS heavy-duty oils (replacing former E6/E9), specifically formulated for high-emission-standard heavy trucks equipped with DPF and EGR systems under high-sulfur or low-sulfur fuel environments.

In addition to basic ACEA standards, major European automakers (OEMs) have introduced their own more stringent approvals based on ACEA requirements:

: Classic long-life Mid-SAPS specification covering most gasoline and diesel engines (equivalent to an enhanced C3).

: Latest 0W-20 low-viscosity "blue oil" standard, designed specifically for modern high-efficiency engines.

: High-SAPS long-life specification (for vehicles without DPF).

: Low/Mid-SAPS specifications with higher anti-corrosion and fuel-saving requirements.

: High-SAPS conventional approval.

: Low/Mid-SAPS approval suited for modern engines equipped with DPF/GPF.

: Designed for high-displacement and high-performance naturally aspirated / turbocharged engines.

: Tailored for engines equipped with particulate filters and select diesel models.

Always refer to the ACEA specification or OEM approval number required by the vehicle manufacturer (e.g., manual requires ACEA C3 or VW 504.00).

ACEA C Series (such as C3, C5, C6) must be used to prevent ash from clogging and damaging the aftertreatment system.

ACEA A3/B4 can be prioritized for superior oil film wear protection.

For frequent highway driving, heavy loads, or aggressive driving, high HTHS oils like C3 or A3/B4 (e.g., 5W-30, 5W-40) are recommended; for daily low fuel consumption and short commutes, prioritize low-viscosity C5/C6 oils (e.g., 0W-20) that match automaker specs.