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Knowledge Centre / FAQ

Engine Oils


Engine oils are used to lubricate bearings, driving gear, cylinders and the steering wheel for the internal combustion engine; they are classified according to their viscosity characteristics (SAE  classes); there are non-alloyed and alloyed engine oils.

The present-day engine oils, their types and special characteristics, are based on different base oils or base oil mixtures. Complementarily, additives are used according to the intended effect. Only a well-balanced formulation (base oil with additive substances) gives a high-performance engine oil.

Base Oils

Base oils bestow on lubricants their fundamental specific characteristics, which noticeably influence the performance of the end products.

Base oil products are distillation and raffination products that are extracted from mineral raw material – petroleum – and consist mainly of saturated hydrocarbons, sometimes with small percentage of unsaturated hydrocarbons.

Hydro-cracking oils are refined mineral oils of high purity and with the enhanced molecular structure.

Poly-alpha-olefins (PAO) are products of petroleum chemistry (synthesis). They are chemically created straight-lined compounds of hydrocarbon.

Synthetic esters are compounds of synthetically created acids with alcohols. They are chemically made products with molecules of every form, structure, type, and size.

Mineral Engine Oils

Engine oils are usually manufactured of mineral oils. Yet these oils have insufficient performance in terms of ever higher requirements such as extended intervals between oil changes, high engine performance, demands of smooth and noiseless engine running, etc. Typical viscosity classes: 10W-40, 15W-40, or 20W-50.

Hydro-Cracking (HC) Engine Oils

Hydro-cracking oils are mineral base oils which were refined with the help of complex chemical engineering. The HC oils also contain a small percentage of synthetic components. Typical viscosity classes: SAE 5W-40, 5W-30, or 10W-40.

Semi-Synthetic Engine Oils

These are mineral oils with synthetic components. They enhance the cold start performance, keep the engine clean, and provide an outstanding wear protection. Typical viscosity classes: 10W-40, 5W-40.

Fully Synthetic Engine Oils

Synthetic base oils provide a basis for the engine oils with significantly enhanced properties. Fully synthetic engine oils can be added into petrol and diesel engines and provide an optimum wear protection, excellent oil supply at the cold start, smooth engine running, and outstanding cleanliness of an engine. They often fulfil the highest requirements API,  ACEA  and comply with the clearances by most engine manufacturers. Especially suitable for long intervals between oil changes. Typical viscosity classes: 0W-30, 0W-40, 5W-40.

Oils for Diesel Engines

At present, the highest requirements on lubricants for conventional and supercharged diesel engines are presented by the classifications ACEA B3 and B4 as well as the clearance VW 505.00. Such oils are optimally suitable for use in self-priming or supercharging diesel engines with or without charge air cooler. High-performance engine oils alone meet these demands, like our Bizol Diesel Ultra SAE 10W40.

Smooth-Running Engine Oils

They have an advantageous flowing characteristics at low temperatures and high thermic stability, and need less pumping. Hence, they have a positive influence on fuel consumption. Typical viscosity classes: 0W-30, 0W-40, 5W-40, 5W-30, 10W-40.

All-Year Oils

They are also known as multigrade oils and can be used in our temperate climate over the whole year. These fluids are not too viscous during the winter and does not become too thin at high engine temperatures, like e.g. 0W-30, 0W-40, 5W-30, 5W-40, 10W-40, 15W-40, 20W-50.






Application & Useful Information

Base Oils

Classifications & Specifications

Engine Oils

Further Parameters

Hydraulic Oils

Transmission & Gear Oils


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