Recommended engine oil for diesel vehicles

Contents

• Why is choosing the right oil for diesel important?
• Chemical composition of oils for diesel engines
• Key parameters for choosing oil
• Viscosity – what should you know?
• What is an approval and why is it decisive?
• Common mistakes when choosing diesel oil
• Practical tips

Choosing engine oil for a diesel car is not a matter of preference, but a strict adherence to the manufacturer's recommendations. Choosing the wrong oil can lead to serious engine damage and costly repairs.

Why is choosing the right oil for diesel important?

Diesel engines, especially those with DPF filters and turbochargers, operate under higher loads and temperature conditions. Therefore, only fully synthetic engine oil compatible with the manufacturer's approval should be used. The lubricating properties of the oil are crucial for protection against wear, deposits, and for extending the interval between oil changes.

Chemical composition of oils for diesel engines

Unlike petrol engines, diesel engines require oils with a higher content of detergents and dispersants. This is necessary for effective cleaning of soot and solid particles that accumulate during combustion. An inappropriate oil composition can lead to DPF filter blockage and degraded engine performance.

Key parameters for choosing oil

When choosing oil for a diesel car, two key parameters must be observed:

1. Viscosity according to SAE standard – for example 5W-30, 0W-30, 5W-40.
2. Specifications and approvals from the manufacturer – for example API SN/CF, ACEA C3 standards or specific approvals like BMW Longlife-04.

Important: the oil must meet the specific approval for your vehicle model.

Example of oil selection:

• vehicle – BMW 320d (G20);
• recommended oil – only synthetic 5W-30 or 0W-30 with BMW Longlife-04 (LL-04) approval.

Viscosity – what should you know?

Viscosity determines the behavior of the oil at different temperatures. For modern diesel engines the most commonly recommended grades are:

• 5W-30 and 0W-30 – provide excellent protection in low and high temperature conditions;
• 5W-40 – additional protection under severe operating conditions.

What is an approval and why is it decisive?

Each vehicle manufacturer has its own quality standards for engine oil:

• BMW Longlife-04;
• Mercedes-Benz 229.51;
• Volkswagen 507.00;
• Porsche C30.

Using oil without the required specification or certification according to API and ACEA standards can lead to problems with the turbocharger and the DPF filter.

Common mistakes when choosing oil for diesel

One of the main mistakes is using semi-synthetic or mineral oil – unsuitable for modern diesel engines.

Choosing oil based solely on viscosity, without following the manufacturer's recommendations, is another issue that should be paid attention to. 

And last but not least – mixing different types of oils.

Practical tips

Always check the vehicle's manual for the manufacturer's exact recommendations. Choose engine oil that matches both viscosity and specification/approval. Do not mix different types of oils – this can worsen the lubricating properties.

When choosing oil for a diesel car the main principle is: only synthetic oil with the appropriate approval and correct viscosity. Adhering to these requirements guarantees a long interval between changes, excellent lubricating properties, and long-lasting engine operation.

If you have doubts about the correct choice for your vehicle, contact the specialists at OnDrive service for professional advice and high-quality service.