I recently purchased a 1998 S70 GLT with about 120,000 miles on it. The car is in great condition. The interior is pristine, except for the sticky mirror controls. Under the hood is great as well. I'm getting around 24 mpg; I drive highway most of the time, with local driving here and there.

The only thing is that I'm running a P0325 code for my knock sensors. My plan is to get them replaced, unless anyone thinks that I should wait to do that.

I would also like some tips for oil changes and any other fluid tips.