ACEA C-GRADE OILS: LOW-SAPS AND MID-SAPS
In the lubrication industry, phosphorus and sulfur are used as core additives. They add strong anti-wear, antioxidant, and anti-friction characteristics to engine oils. Despite their strong properties, a high concentration of these substances can poison and damage the vehicle’s diesel particulate filter and two-way catalytic converter. That is why ACEA sets strict recommendations on how much phosphorus and sulfur should be applied to engine oil.
Engine oils with a lower amount of phosphorus and sulfur are called low-SAPS oils, also low-ash oils. These oils belong to the C category in ACEA’s oil classification, where “c” stands for catalyst-compatible.
According to ACEA, C-grade oils are stable, low-friction, and low-viscosity oils. They are used in vehicles equipped with diesel particulate filters (DPFs) and three-way catalytic converters (TWCs). C-grade oils are also used in high-performance diesel and petrol engines that require the use of oils with low levels of SAPS content.
C3 MID-SAPS OILS
C3 are mid-SAPS oils with a sulfated content lower than 0.8%. Those are low-friction and have a minimum HT/HS viscosity of 3.5 cP.