Why “Suitable for Use” Is Not the Same as OEM Approved – and Why It Matters for Your Engine

When selecting an engine oil, it can be tempting to rely on the label. However, not all oils are created equal, and the distinction between “Suitable for Use” (SFU) and OEM-approved products is critical for protecting your engine and maintaining performance over time.

At FUCHS UK, our goal is to support you in making informed and confident decisions about your lubricants. In this article, we explore the difference between these two classifications – and why choosing the right oil goes far beyond what is printed on the bottle.

Understanding the Terminology

Phrases such as “Meets the requirements of…” or “Suitable for use in vehicles requiring…” are common across many engine oil labels. These are known as self-certified claims, meaning the oil is marketed as being compliant with a specification (for example, ACEA or a vehicle manufacturer’s standard) without undergoing formal, independent validation.

By contrast, OEM-approved oils have been subjected to rigorous testing protocols, often including bespoke engine tests and stringent technical assessments defined by the original equipment manufacturer. Only once all performance criteria are met does the OEM issue an official approval, providing a higher level of assurance to the end user.

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