Check suspension and brakes: Tie rods, ends, bushes (all of them) for movement. Shocks for leaks. Uni joints for movement/play. Brake pads for wear, Brake discs for wear, brake fluid and anything wrong with the brakes.
Check Exhaust for leaks, rust
Check tyres for wear (wheel alignment, camber wear)
I use Penrite oils but because I'm broke I use Shell at the moment (so cheap at Kmart).
In the end, you might just end up doing an oil change and not a service.