ACEA A5 B5-21

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-36-90 cP ≥ 2.9 and ≥ 3.5
Sulphated Ash ASTM D874 %m/m ≤ 1.6
Phosphorus ASTM D5185 or
ASTM D4951
%m/m Report
Sulphur ASTM D5185 or
ASTM D4951
%m/m Report
Evaporation loss (NOACK) CEC L-40-93 % ≤ 13
Total Base Number ASTM D2896 and
ASTM D4739
mgKOH/g ≥ 8.0 Report

The low HTHS (≤2.9 and ≤3.5 cP) required by ACEA A5/B5 limits the number of additional performance claims that can be coupled with ACEA A5/B5.

OEM approvals connected to the ACEA A5/B5 category includes:

  • RN0700 & RN0710
  • MB 229.6
  • BMW LL-01 FE
  • Volvo Cars 95200377
  • JLR STJLR.03.5003
  • 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. Since then, the categories have continued to evolve and adapt to hardware and market trends. For ACEA 2021several changes to the requirements for ACEA A5/B5 have been made which raise the performance levels required for A3/B4 approvals. The inclusion of the M271 EVO Sludge aligns testing to include Gasoline Direct Injection engines, now an increasingly common hardware solution.

Additionally, the VW TDI3 is bought in to replace the VW TDI2 test for piston cleanliness. Utilising a Euro 6 engine this enables testing representative of current and future hardware trends, including the anticipated increased in use of Exhaust Gas Recirculation (EGR) and the resulting increased soot levels.

The changes for ACEA 2021 are summarised below: 

Test Additional tests for ACEA 2021
CEC L-107-19 M271 Evo Black Sludge
CEC L-117-20  VW TDI Piston Cleanliness (TDI3)
ASTM D8256 Sequence VH Low Temperature Sludge 
ASTM D8350 Sequence IVB  Valvetrain Wear


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.