Engine Oil with MB-Approval 229.52

Where 229.52 comes from and what it does better

Mercedes introduced 229.52 as the successor sheet to 229.51, with two things tightened up: the oil has to stay oxidation stable for longer - which matters at the high oil temperatures of modern, encapsulated diesels - and it has to make a measurable contribution to lowering fuel consumption. On top of that comes compatibility with the exhaust after-treatment of particulate filter and SCR catalyst, as practically every Mercedes diesel from Euro 6 has on board.

What matters day to day is the substitution rule: **229.52 covers 229.51**, but not the other way round. If the manual calls for 229.52, that number has to be on the pack.

Its place in the 229 family

• **229.5** - high-performance oil with no ash limit, for models without a particulate filter
• **229.51** - the first Low SAPS step, diesels with a filter from around 2005
• **229.52** - this page: like 229.51, plus oxidation stability and fuel consumption
• **229.71 / 229.72** - the thin 0W-20 sheets of the newest engines, no alternative to 229.5x

Viscosity remains a separate specification: 229.52 comes above all in 5W-30 and 0W-30. What counts is the combination of sheet number and the SAE grade named in the service book.

An approval means listed

An MB-Approval is a homologation of the specific product: Mercedes tests the oil and enters it in the public BeVo list. "Corresponds to 229.52", by contrast, is a claim the oil manufacturer makes itself - for a car under warranty that is not the same thing. An approved oil carries the number on the label with no qualifiers.