Engine oil for BMW, Mercedes-Benz and Jeep: how to read Longlife, MB 229 and MS codes before an oil change

At oil change time, many owners ask only one question: what viscosity? But for BMW, Mercedes-Benz and Jeep, the manufacturers specify more than a number like 5W-30. They set their own approval standards that the oil must meet, and those standards can differ between one engine and another of the same brand.

This article explains how to read those codes: BMW Longlife, the Mercedes-Benz 229 approvals, and the Chrysler or FCA material standards used by Jeep. The main sources are manufacturer manuals and documents, because they decide which oils may be used in their engines.

An SAE code such as 0W-20 or 5W-30 indicates the oil's viscosity: how easily the oil flows when cold and how thick it is at operating temperature. A manufacturer approval code indicates something else, namely a set of performance requirements set by the car maker, for example protection against deposits, wear, and the exhaust aftertreatment system.

That is why the two have to be read together. An oil with the right viscosity does not necessarily meet the manufacturer approval, and an oil that carries the approval code but has the wrong viscosity is also not necessarily suitable. The Mercedes-Benz manual, for example, asks owners to choose an SAE viscosity suitable for the ambient temperature and only use oil approved for that engine.

BMW uses Longlife labels with numbers. A higher number does not mean a better oil for every engine, because each label is written for a specific group of engines:

• Longlife-01 (LL-01): used by many BMW gasoline engines without a particulate filter, especially from the early 2000s. A 2008 BMW dealer document in the United States also lists LL-01 oils for gasoline engines, and SAE 10W-60 oil specifically for M cars with the S54, S62, S65 or S85 engines.
• Longlife-04 (LL-04): made to protect particulate filters. This oil is approved for diesel engines and gasoline engines with a particulate filter. For gasoline engines without a particulate filter, BMW documentation generally limits its use to Europe, Norway, Switzerland and Liechtenstein.
• Longlife-12 FE, Longlife-14 FE+, Longlife-17 FE+ and beyond: low-viscosity fuel economy oil standards, only for engines that are specifically approved. These standards are not a general replacement for LL-01 or LL-04.

For BMWs sold outside Europe, this LL-04 restriction on gasoline engines without a particulate filter is the one most often missed. Make sure of the Longlife label your car's manual asks for, and make sure that label is printed on the oil container.

The United States edition of the Mercedes-Benz C-Class W204 manual for the 2012 model emphasizes several things:

• Use only engine oils and oil filters approved for vehicles with the Mercedes-Benz maintenance system.
• Do not use oil with a specification other than required, and do not extend the oil change interval beyond what is set, because this can damage the engine and the exhaust aftertreatment system.
• The table in that manual lists the MB 229.3, 229.5 and 229.51 approvals for its engine variants, with details per engine. The approval is printed on the oil container.
• For the C 63 AMG, the manual restricts the choice to SAE 0W-40 or SAE 5W-40 oil only.
• Do not add additives to the engine oil.

The approval list differs by model, engine and year, so the table from one model's manual must not simply be used for another model. Check your Mercedes-Benz manual or ask an authorized dealer.

On Jeep, Chrysler, Dodge and Ram, the oil requirement is usually written as a manufacturer material standard with an MS code, for example MS-6395 or MS-13340, plus the SAE viscosity and API certification. The MS code is not a viscosity number. The Grand Cherokee is a good example: a source explaining this standard says the 3.6 V6 engine uses 0W-20 oil meeting MS-6395, while the 2.0 turbo engine uses a different requirement.

The 2023 Jeep Grand Cherokee manual, European edition, recommends for the 2.0L engine a full synthetic SAE 5W-30 oil certified API SP/GF-6A that meets Material Standard MS-13340. The same manual says the manufacturer only recommends API certified oils, and advises against additives other than leak detection dyes and chemical flushes. This means that even within the Jeep family the specification follows the engine and year, not the model name. Use your car's manual and the information on the oil filler cap as the main reference.

The oil specification is closely tied to the maintenance interval. The Mercedes-Benz manual asks owners to follow the service interval display for oil changes, and not to use other oils or filters to extend the interval beyond what is set. Unsuitable oil can make the long interval designed by the manufacturer damage the engine and the exhaust aftertreatment system instead.

A BMW dealer document in the United States also advises owners to check the oil level every time they add fuel, and if needed to top up oil between changes using an oil with the same approval. This simple habit helps find out early if the engine starts to consume oil.

1. Start from the manual. Note the SAE viscosity and the approval code required for your car's engine.
2. Match the viscosity on the container. A number like 5W-30 must be the same as required, or be among the options the manual allows.
3. Look for the exact approval code. For example BMW Longlife-01, MB 229.5 or MS-6395. General wording like "for European cars", "full synthetic" or "high performance" does not prove approval.
4. Pay attention to the wording. A container that says "approved" or lists an approval number differs from a container that only says "recommended for" or "meets the requirements of".
5. Keep the purchase receipt and record the oil used in the service records.