Frequently Asked Questions About Engine Oil

Do you need to change your engine oil on a regular basis?

The short answer is yes. Over time engine oil breaks down and reduces in performance. As the motor oil breaks down, its effectiveness at protecting and lubricating the important parts of the engine is reduced.

Most people think that the only job of engine oil is to lubricate the moving parts of an engine. What they don't realise is that motor oil also carries away combustion byproducts cylinders and pistons. It is specifically designed to pickup and carry away any dust or dirt that appears in the engine (often through the air-intake system) and also remove the tiny amounts of water that sometimes form as the engine repeatidly heats and cools. Therefore making sure that the oil is regularly changed helps ensure the best performance of the oil.

What is the difference between mineral and synthetic oils?

The biggest difference between mineral oil and synthetic oil lies in the processing of the petroleum. While mineral oil is obtained from crude oil through distillation and refining, the production of synthetic oil through further refining measures is much more extensive. Although mineral oils are much cheaper, synthetic oils perform better due to their improved properties. Synthetic oils have better flow even at lower temperatures, like in winter. During a cold start, for example, the engine is supplied with oil more quickly. The fully synthetic oil thus reaches the points to be lubricated more easily and puts less strain on the engine than conventional mineral oil. Furthermore, the synthetic oil is more temperature-stable. At high temperatures (high speed, full load), the lubricating film does not become too thin and does not tear off.

In order to lubricate efficiently and reduce friction, oils are undoubtedly indispensable. But whether it should be the inexpensive mineral oil or the elaborately manufactured synthetic oil - opinions differ.

Why Does Engine Oil Go Black?

In its unused, clean form, motor oil is yellow to brown in color and has a thin or viscous consistency. Engine oil turns black over time or takes on a very dark color because it carries away dirt that is produced when the fuel burns in the engine. In addition, an engine is of course not completely clean, so that the engine oil also comes into contact with other dirt and soot particles and is blackened as a result. So when it goes black you know it is doing its job properly as its taking away all the nasty dirt from the engine.

What should engine oil look like?

With new engine oils, the appearance can be assessed particularly well during filling: fresh engine oil should be slightly transparent. It should also have a honey-colored, slightly brownish color. Functional motor oil also looks smooth and, unlike old motor oil, does not contain any black residue. If such residues are present, the engine oil should be changed as soon as possible because these black particles come from the engine compartment and are produced during the combustion process. In particular, the engine oil should look clean. However, the appearance of some engine oils can also deviate slightly from the norm: certain additives that are added to the engine oil to improve and strengthen its properties can cause the oil to take on a different colour.

The added additives can, for example, cause the oil to appear silvery, but dark gray discolorations are also normal here. The appearance of the engine oil is therefore not only dependent on the quality and cleanliness, but is also largely determined by the make and model. If you are not sure whether the color and consistency of your motor oil is normal, you can contact the manufacturer or contact us directly - we at Motoroel can provide some information about the product in question. en give you information about the appearance of the oil. Good quality and clean motor oil is especially important to properly lubricate and cool the vehicle's engine. Dirty or old oil can quickly cause major damage to the engine, which can often only be eliminated by expensive repairs

Frequently Asked Questions
The Most Frequently Asked Questions About Engine Oil


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The content of the website was created with the greatest of care to ensure the accuracy and completeness of the information and to the best of our knowledge and belief. However, no guarantee can be given for the correctness and completeness of the data. For this reason, any liability for any damage in connection with the use of the information offered is excluded. Information and articles must in no case be regarded as a substitute for professional advice and/or repairs by trained and recognised workshops. Please check your vehicle's handbook or directly with the manufacturer to ensure you are using the correct oil.