What MB-Approval sheets are
Mercedes-Benz maintains its own system of oil approvals, published as MB-Approval sheets. Each sheet carries a number — examples include 229.5, 229.51, and 229.71 — and identifies a specific set of performance and chemistry requirements that an oil must be validated against. When a Mercedes-Benz engine calls for a particular sheet, only oils carrying that approval are confirmed as suitable.
The different numbers reflect different needs. Some sheets describe lower-SAPS or efficiency-oriented formulations intended for newer engines and emissions hardware, while others address earlier or broader requirements. Because the differences can be significant, the sheet number is an important detail rather than an interchangeable label.
How they relate to viscosity
An MB-Approval sheet tells you the performance and chemistry level an oil meets, but it does not by itself define the viscosity grade. The grade — for example 5W-30 — describes flow behavior and is a separate piece of information.
For your engine, the oil should meet the MB-Approval sheet your manual calls for AND the correct viscosity grade. Both are required, and a product that satisfies only one of them is not a complete match.
What to follow
Because each MB-Approval sheet targets specific engine and emissions setups, the sheets are not all interchangeable. Substituting one for another without confirmation can be unsuitable, especially where modern emissions hardware is involved.
The owner’s manual is the authority on which MB-Approval sheet and which grade your specific Mercedes-Benz needs. When in doubt, defer to the manual rather than assuming one sheet can replace another.