I don't know if this has been discussed already so if it's old news please disregard.
For those of you who are members of the STLE you may have noticed the published ACEA specifications in this months Tribology & Lubrication Technology magazine. Here is a brief overview for those of you that are interested:
- For gasoline and small diesel engines, ACEA has replaced the A and B sequences with revised A/B categories and has introduced new C sequences, for "catalyst compatibility oils." Only four A/B combinations are allowed:
1) A1/B1. Oil intended for use in gasoline car and light van diesel engines specifically capable of using low friction, low-viscosity oils.
2) A3/B3. Stable, stay-in-grade oil intended for use in high-performance gasoline car and light van diesel engines and/or for extended drain intervals and/or for year-round use of low-viscosity oils and/or for severe operating conditions as defined by the engine manufacturer.
3) A3/B4. Stable, stay-in-grade oil intended for use in high-performance gasoline and direct injection diesel engines.
4) A5/B5. Stable, stay-in-grade oil intended for use for extended drain intervals in high-performance gasoline car and light van diesel engines designed to be capable of using low-friction, low-viscosity oils.
All three-catalyst compatibility (C) sequences are for stable, stay-in-grade oils intended for use in high-performance car and light van diesel and gasoline engines with three-way catalyst (TWC) and diesel particulate filters (DPF's). The C categories are:
1) C1. For engines requiring low friction, low viscosity, and low SAPS oils.
2) C2. For engines requiring only low friction, low viscosity oils.
3) C3. For all other engines.
The C sequences are roughly based on the performance criteria of the A5/B5 sequence but with chemical limits. To meet Euro 4 emission regulations, manufacturers of heavy duty diesel engines have introduced either EGR based systems, many of which include a diesel particulate filter, or selective catalytic reduction systems.
ACEA has deleted the E3 and E5 sequences and introduced a new E7 sequence, which is essentially an upgrade of E5. E4, E6 and E7 categories are for stable, stay-in-grade oil recommended for highly rated diesel engines meeting Euro 1,2,3, and 4 emission requirements.
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I'm certain that the new information will show up on the ACEA web page in the near future.
Fow
For those of you who are members of the STLE you may have noticed the published ACEA specifications in this months Tribology & Lubrication Technology magazine. Here is a brief overview for those of you that are interested:
- For gasoline and small diesel engines, ACEA has replaced the A and B sequences with revised A/B categories and has introduced new C sequences, for "catalyst compatibility oils." Only four A/B combinations are allowed:
1) A1/B1. Oil intended for use in gasoline car and light van diesel engines specifically capable of using low friction, low-viscosity oils.
2) A3/B3. Stable, stay-in-grade oil intended for use in high-performance gasoline car and light van diesel engines and/or for extended drain intervals and/or for year-round use of low-viscosity oils and/or for severe operating conditions as defined by the engine manufacturer.
3) A3/B4. Stable, stay-in-grade oil intended for use in high-performance gasoline and direct injection diesel engines.
4) A5/B5. Stable, stay-in-grade oil intended for use for extended drain intervals in high-performance gasoline car and light van diesel engines designed to be capable of using low-friction, low-viscosity oils.
All three-catalyst compatibility (C) sequences are for stable, stay-in-grade oils intended for use in high-performance car and light van diesel and gasoline engines with three-way catalyst (TWC) and diesel particulate filters (DPF's). The C categories are:
1) C1. For engines requiring low friction, low viscosity, and low SAPS oils.
2) C2. For engines requiring only low friction, low viscosity oils.
3) C3. For all other engines.
The C sequences are roughly based on the performance criteria of the A5/B5 sequence but with chemical limits. To meet Euro 4 emission regulations, manufacturers of heavy duty diesel engines have introduced either EGR based systems, many of which include a diesel particulate filter, or selective catalytic reduction systems.
ACEA has deleted the E3 and E5 sequences and introduced a new E7 sequence, which is essentially an upgrade of E5. E4, E6 and E7 categories are for stable, stay-in-grade oil recommended for highly rated diesel engines meeting Euro 1,2,3, and 4 emission requirements.
--
I'm certain that the new information will show up on the ACEA web page in the near future.
Fow
