ACEA A5 B5-16
ACEA A5/B5 oils are Upper Mainline lubricants. They are designed for use in high performance gasoline and light duty diesel engines that are specifically designed to use a low viscosity oil. These oils may be unsuitable for use in some engines.
ACEA A5/B5 oils are typically low HTHS (≤3.5cP) SAE 5W-30 based on API Group III base oils. The main physical and chemical requirements for ACEA A5/B5 are shown below:
| Requirement | Method | Unit | Limit |
| HTHS viscosity | CEC L-36-A-90 | cP | ≥ 2.9 and ≥ 3.5 |
| Sulphated Ash | ASTM D874 | %wt | ≤ 1.6 |
| Phosphorus | ASTM D5185 | %wt | Report |
| Sulphur | ASTM D5185 | %wt | Report |
| Evaporation loss (NOACK) | CEC L-40-A-93 | % | ≤ 13 |
| Total Base Number | ASTM D2896 | mgKOH/g | ≥ 8.0 |
The low HTHS (≤3.5cP) required by ACEA A5/B5 limits the number of additional performance claims that can be coupled with ACEA A5/B5.
Prior to ACEA 2010, ACEA A5/B5 was not usually coupled any OEM specifications. However, Ford issued a revision to WSS-M2C913-B which raised the minimum ACEA performance level from ACEA A1/B1 to ACEA A5/B5. Therefore, some ACEA A5/B5 engine oils also meet the requirements of Ford WSS-M2C913-D.
ACEA A5/B5 was first introduced into the ACEA Oil Sequences in 2004, however, it is based upon the original ACEA A5 and ACEA B5 sequences that were introduced in 2002.
For ACEA 2016 a small number of changes to the requirements for ACEA A5/B5 have been made. The inclusion of the new OM646LA BIO engine test and CEC L-109 oil oxidation test with Biodiesel shows the increasing importance of biodiesel in the marketplace. Additionally, the new DV6 engine test, as a replacement for the DV4 test along with the PSA EP6 engine test highlights the increased piston cleanliness and soot handling requirements of ACEA 2016.
The changes for ACEA 2016 are summarised below:
| Test | Change for ACEA 2016 |
| CEC L-112 | New seals materials for oil elastomer compatibility |
| CEC L-109 | Biodiesel Oxidation test added to replace GFC-LU-43A-11. |
| CEC L-106 | DV6 Oil dispersion at medium temperature now compulsory, replaced DV4. |
| CEC L-111-16 | PSA EP6 piston cleanliness test added |
| CEC L038-94 | TU3M scuffing test removed |
| CEC L-088-02 | TU5JP-L4 high temperature deposits test removed |
| Daimler M271 Evo | Black Sludge test added (required once available) |
| CEC L-104-16 | OM646LA BIO Effects of Biodiesel test added |
For a deeper dive into specifications, see the Lubrizol Ready Reference Guide, the industry's go-to resource for understanding fuel and lubricant performance principles and requirements.