All 2008 Cadillac STS questions

I'm a newbie with no automotive training but trying to save money but doing simple things my...

re signal functions.I can see that the bulb is black. how do I get to the bulb socket to replace ...

I am trying to change the oil in my 2008 sts v6 and cannot locate the oil drain plug or the oil f...

At what point should I get the folowing things done? Rear differential, transmission flushed, fue...