Being a S3, access wil be fun.

I prime the oil galley via the oil switch hole with a large syringe filled with oil.

It will prime the main gallery, oil pump, and the crankshaft.

It MAY push some to the top end, but doubtful, so I usually assembly lube the cams prior to covers on.

Also liberally coat the chains and guides with assemby lube.

I also set the tappets prior to intalling the head, it is just easier.