Recommended engine oils for Golf and Bora – Volkswagen recommends oils according to its own standards. For gasoline engines, these are VW 500 00, VW 501 01 or VW 502 02. For those built from June 1999 cars with extended service mileage (Longlife Service) these are oils in accordance with the VW standard 503 00.
VW standard oil should be used for diesel engines 50 500, VW 50 000 or VW 50 101 (at the Longlife Service – VW 506 00). Volkswagen only permits the use of other oils in "exceptional cases."”. For gasoline engines 1,4 i 1,6 l monograde or multigrade oils according to the ACEA A2 / A3 standard can be used. Oils according to API-SF or API-SG classification can be used for other gasoline engines, and for diesel engines according to API-CD.
Multigrade oils are based on low-fluidity monograde oils, to which are added after heating the oil, the so-called. viscosity index improvers. In this way, the required lubricating properties of the oil are ensured for both the cold oil, and a hot engine.
About that, which oil is suitable determines its composition and viscosity grade. About: if you need to add oil, you can use a different manufacturer's oil. However, this can lead to a deterioration in the properties of the oil. Each brand of oil has different sets of additives, which may lose their properties when mixed with another oil. For these reasons, mixing synthetic and mineral oil does not make sense.
VW recommendations for oil viscosity.
In Central European conditions, 15W-40 oil can be used all year round.
A: Light oils (synthetic) multigrade according to VW standard 500 00 for gasoline engines; not suitable for engines 1,9 TDI.
B: Multigrade oils according to VW standard 505 00 (all engines) or according to VW standard 501 01 or API SF or SG for gasoline engines; not suitable for engines 1,9 TDI
ATTENTION: Oils designed exclusively for diesel engines should not be mixed with oils intended for gasoline engines, as this may damage the engine.
Oil consumption
If the engine is in good technical condition, it should use so little oil, that there is no need to top it up (or only small amounts are added) between oil change cycles. You will only achieve it then, if you changed the oil regularly and you did not overload the engine with too dynamic driving.
The engine is consuming oil, as it enters the combustion chamber. Leaking engine, damaged valve stem seals, improper positioning of the piston rings, excessive play between valve guides and stems increases oil uptake. But the fact that there is no oil loss whatsoever is by no means a reason to be happy. This shows that the oil has been diluted with fuel or condensation water, which would worsen its lubricating properties. This can especially happen in winter, if you use the car for short trips in the city. In this case, change the oil after 3 000 km or after four months.