Mercedes-Benz MB 229.51 motor oils has to pass a fuel economy test which limited to at least 1.7% saving comparing to reference oil.
MB 229.52 motor oils sets this limit to 1% more comparing to MB 229.51 oils.
Using MB 229.52 means at least 2.7% fuel economy gain compare to reference oil RL191 SAE 15W40 which has HTHS 3.9 mPa. MB oils HTHS limit is minimum 3.5 mPa.
They also more resistance to oxidative thickening than MB 229.51 oils.
Approved Mercedes-Benz MB 229.52 oils can be found in below page:
https://bevo.mercedes-benz.com/bevolisten/229.52_en.html
MB 229.52 motor oils sets this limit to 1% more comparing to MB 229.51 oils.
Using MB 229.52 means at least 2.7% fuel economy gain compare to reference oil RL191 SAE 15W40 which has HTHS 3.9 mPa. MB oils HTHS limit is minimum 3.5 mPa.
They also more resistance to oxidative thickening than MB 229.51 oils.
Approved Mercedes-Benz MB 229.52 oils can be found in below page:
https://bevo.mercedes-benz.com/bevolisten/229.52_en.html
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