Can I use 5W40 instead of 5W20

Can you mix engine oils?

The extensive range of various motor oils on the shelves confuses many consumers. You are not only wondering which type of engine oil is best for your vehicle, but also, if you still have leftovers in the container, whether you can mix material to fill it up. The following article is intended to answer the most frequently asked questions about mixing motor oil.

1) Can engine oils be mixed with one another?

In general, all engine oils can be mixed with one another. The viscosity, whether 5w40 or 5w30, synthetic or mineral, is not important when mixing engine oil. This is expressly guaranteed to consumers by the manufacturers. When mixing engine oil, however, it is essential to ensure that the oil used is approved by the manufacturer for the vehicle. If, on the other hand, engine oils are mixed that do not meet the required specifications, engine damage can result.

2) mix synthetic or mineral oil based oils?

Mineral oils and synthetic oils may also be mixed with one another if both oils are approved for one type of engine (diesel engine or Otto engine). On the other hand, oils that have been developed for different engine concepts should not be mixed with one another. In addition, under no circumstances should 2-stroke engine oils be mixed with oils that are approved for four-stroke diesel or gasoline engines. If, for example, an engine is filled with an oil with a lower performance than recommended by the vehicle manufacturer, this usually leads to damage. Higher-quality engine oil, on the other hand, can be refilled without hesitation.

3) mix engine oils from different manufacturers?

The quality of motor oils is defined by the Association of European Automobile Manufacturers (ACEA). The terms used in the ACEA specifications are made up of a number that classifies the oil performance, the exhaust gas aftertreatment and the suitability for a certain type of engine. Class A stands for car gasoline engines (gasoline), class B for diesel engines for vans, vans and cars, class C for car diesel and car gasoline engines with new exhaust gas aftertreatment systems (e.g. DPF) and class E for truck diesel engines.

4) Mix a 5w40 engine oil with a 10w40 engine oil?

In addition, some vehicle manufacturers, such as Peugeot, Porsche, Opel, Fiat, Ford, VW, Mercedes Benz and BMW, have also developed their own OEM specifications, which declare the suitability of an engine oil for certain engine variants and vehicle models. When buying engine oil after manufacturer approval, it must be checked whether the manufacturer has actually given approval for the product. If the manufacturer specifies different viscosities, one of them may be topped up, regardless of which oil is in the engine.

SAE is an abbreviation for "Society of Automotive Engineers" and characterizes the flowability of an engine oil. Multigrade oils can be used in vehicles all year round and can also be mixed with one another.

It is generally possible to mix engine oils from different manufacturers if both types of oil have the same specifications and have been approved by the automobile manufacturer. However, products from different manufacturers should only be mixed together if the information on the sales packaging is clear. Motor vehicle workshops, for example, do not always top up with the same brand of engine oil.

5) Quality of Mixed Motor Oils?

Mixed engine oils can be of acceptable quality if the types that are mixed with the engine oil meet the prescribed specifications. Although every manufacturer uses different mixtures for their engine oils, the various components do not form any compounds that could damage the engine. In any case, it is better to mix engine oils from different manufacturers than to drive the vehicle with too little engine oil.


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