Whats the best oil to use in a mk3 1.8 spi 95 model? i've been told 15w40 but seems v.thick. I've always used 0w40 sport oil made by castrol(edge). is this too thin for a car thats done 100,000? no tapping at all or any probs that wud normally relate to thin oil.
Opinions?
cheers,
andy