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ACEA Class Definition
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B1 : Diesel engine oil whose viscosity protection feature exceeds CCMC PD-2 limits, provides fuel economy and is valid for low viscosity classes.
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B2 : Conventional diesel engine oil, generally in CCMC PD-2 performance, with improved viscosity retention.
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B3 : High performance diesel engine oil whose viscosity protection feature exceeds CCMC PD-2 limits and whose viscosity increase is controlled under heavy soot.
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B4 : Diesel engine oil that has passed direct injection engine tests in addition to B3-98 performance.
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B5 : Diesel engine oil with low viscosity class, high friction reduction feature, long oil change period, providing fuel economy in indirect and direct injection engines.
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