Motor was replaced 10k ago
 

Yeah, I just found allll of the service records for my 8 from the previous owner, and had found that the motor had been replaced just a hair over 10k miles ago. So knowing that, i'm going to try and keep it as strong as I can. 5w40 oil, possibly start premixing and regular fluid change.

I just replaced the spark plugs, before I had known this. Any clue as to what else should be done in slew of a new motor?

How did the plugs look? Pics if you can. What model, year, transmission, miles on car, other parts replaced.....more info please......BTW I pre-mix.