ACEA C2 oils are Top Tier lower SAPS1 lubricants. They are designed for use in high performance gasoline and light duty diesel engines where advanced aftertreatment systems such as Diesel Particulate Filters (DPFs) and Three Way Catalysts (TWC) are used.
ACEA C2 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 C2 are shown below:
|HTHS viscosity||CEC L-36-A-90||cP||≥ 2.9|
|Sulphated Ash||ASTM D874||%wt||≤ 0.8|
|Phosphorus||ASTM D5185||%wt||≥ 0.070 and ≤ 0.090|
|Sulphur||ASTM D5185||%wt||≤ 0.3|
|Evaporation loss (NOACK)||CEC L-40-A-93||%||≤ 13|
|Total Base Number||ASTM D2896||mgKOH/g|
Although the “mid SAPS1” requirements for ACEA C2 align well with many OEM performance specifications ACEA C2 oils are usually formulated to a low HTHS (≤3.5cP) to achieve the high level of fuel economy improvement required. This limits the number of additional performance claims that can be coupled with ACEA C2.
Although ACEA C2 oils do not usually carry any additional performance claims a number of OEMs (for example PSA) specify ACEA C2 oils as suitable for some of their vehicles.
Note 1 : SAPS refers to Sulphated Ash, Phosphorus and Sulphur, the levels of which are often restricted in the latest performance specifications.
ACEA C2 was first introduced into the ACEA Oil Sequences in 2004 and was not updated in the 2007 issue of the Sequences.
For ACEA 2010 a number of changes to the requirements for ACEA C2 have been made. These include the inclusion of the new OM646LA engine test, as a replacement for the OM602A, along with an increase in sludge handling.
The inclusion of the new OM646LA engine test raises the diesel wear protection performance demanded from ACEA C2 oils.
The changes for ACEA 2010 are summarised below:
|Test||Change for ACEA 2010|
|OM646LA||New test added|
|M111SL||Average engine sludge to requirement to increase from ≥ RL140 to ≥ RL140 + 4 standard deviations or ≥ 9.0%|
The relative performance diagrams presented below compare Lubrizol’s interpretation of the performance of requirements of the existing ACEA 2007 C2-07 oil sequence with the ACEA 2010 version. As shown, ACEA 2010 C2-10 represents an upgrade in wear protection and sludge handling.