These additives provide better corrosion protection, increased resistance to oxidation, crankcase sludge, improved viscosity, cleaning and dissolving properties. Cleaning and dissolving additives not only reduce the formation of carbon deposits in the engine, but also have the ability to dissolve carbon deposits and, along with other contaminants, break it down into tiny particles and keep them in suspension, so that when the oil is changed, they merge with the oil.
HD oil quality is listed in the API system (API: American Petroleum Institut). The designation is given by two letters. The first letter indicates the area of application: S = service, suitable for gasoline engines; C = commercial, suitable for diesel engines. The second letter indicates the quality in alphabetical order. The highest quality in the API system is owned by oils of the SG specification for gasoline internal combustion engines and CD for diesel engines.
Attention! CD engine oils designated by the manufacturer as oils for diesel engines only are not suitable for gasoline engines. There are oils that are suitable for both gasoline and diesel engines. In this case, both specifications are indicated on the packaging (ex: SG/CD).
VW AG has set its own oil standards for VW car models. Oils that comply with these standards must be used. If in doubt, approved oils can be obtained from sales representatives.
Gasoline engines require heavy-duty oils that must simultaneously meet both VW 50000 and 50500 standards. VW-50000 low-viscosity oils or VW-50101 multigrade oils can also be used. All-weather oils that meet the VW-50101 standard are usually more expensive. If oil of this specification is not available, a seasonal or multigrade API-SG specification oil can be temporarily used.
Diesel engines can use VW 50101, VW 50500, API-CD or VW 50000 light oils.
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