Steve's right. However if you are lucky, then the first thing that happened is the cam seized in its journals & broke the timing belt bringing everything to a sudden stop. If that happened, try taking the cam out & use some crocus cloth to smooth out the galling in the journals & get the melted aluminum off the cam bearings. Stick a new timing belt on it & throw some 20w50 in it. It is not a repair by any means, and it likely will rattle & knock, but I've seen several cases where this has happened and people nursed another 30k or more out of them. In fact one fool managed to do that to his B21A twice without utterly destroying it. Third time wasn't a charm, though, the clattering was just so bad he got a used motor. The oil light came on and he drove another 40kms, all we could figure is by that point the tolerances were so sloppy in the engine that nothing actually seized up, it just kept getting noisier. The foolish things you see people do when you spend enough time hanging around a garage...
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Chris, Dartmouth NS Canada 70 M-B 280SE, 83 245DL, 84 244 turbo, 90 780 turbo, 92 VW Golf, 90 740 Rex/Regina