229.52 is much more difficult to find at auto parts stores and may require going to your Mercedes dealership where it's twice the cost of other synthetic oils.
"lower levels of Sulphated Ash, Phosphorous and Sulphur (SAPS) in the engine lubricant. SAPS are important components in the formulation of a lubricant, providing wear protection and cleanliness performance amongst many other benefits. However, if the chemistry within a lubricant contains SAPS above OEM-specified limits, the levels of ash created during combustion can eventually completely block the filtration channels [in the diesel particulate filter]
requiring DPF replacement or cleaning and incurring large expense for the vehicle owner."
"Marketed by Daimler as "Low SPAsh multigrade service engine oils," approved MB 229.52 lubricants must deliver at least 0.7% fuel economy improvement compared to the MB 229.51 and MB 229.31 specifications. To achieve this, lubricants must have improved cold flow properties to reduce friction within the engine, allowing oil to flow effectively at start-up. This lowers the vehicle's fuel consumption by increasing efficiency
MB 229.52 specification
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