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Automotive glossary

ACEA Oil Specification

ACEA specifications are European engine oil quality classes, such as A/B for petrol and diesel, C for low-ash oils and E for heavy-duty diesels.

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What is ACEA Oil Specification?

A typical label reads ACEA C3 or A3/B4. C classes are designed for cars with particulate filters and catalytic converters. The classes are updated periodically. The year of the ACEA sequence shows which version of the tests the oil meets.

How it works

Oils must pass a set of engine and laboratory tests to claim an ACEA class.

Why it matters for your car

Many manufacturers also require their own approval in addition to ACEA. A and C classes are not interchangeable in every car.

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