Casrol Rs Oil In A Gti

[stella]

is it ok to use a thin oil in the gti 4age engine?the Castrol rs oil i was looking was a 0w 40,the oil im useing at the mo is pennzoil 10w40?

stella

[Unity Jon]

dont use fully synthetic and dont use anything with 'mag' in the name (i.e. magnatec)

The numbers refer to temps and viscocity, the first number is for Winter (hence the 'w') we live in a pretty cold country dont forget. I wouldnt use anything less than 10.... theres loads of ref: on the web about motor oil.