what year model?

[mirage83]

Can't say about the 1G on the subject of oil leaks, just don't know enough about that engine. The valve covers are the obvious place to start checking, as well as the front and rear main seals.

163k klicks on one of these engines isn't really high mileage, but miles aren't really the most important factor in whether your engine is really okay or not. The biggie is how well it was maintained by the previous owners.

I'd start checking all the IC piping for cracks and partial disconnects, as things like that can cause all sorts of mischief with the way the engine runs and turbo boosts.

Unless it's been pulled at some point in the past and not replaced, you should have a LSD diff, probably a 3.73.