follow the instructions here http://myfordfocus.com/how-to/oilchange.htm
The 2000 Ford Focus Owner Guide shows : with engine oil filter change : ( 3.78 liters ) for the SPI engine ( 4.25 liters ) for the ZETEC engine
Remove oil pan
You cannot!
When you change the oil and oil filter.
Very Carefully
5w20
My 2000 Ford Focus owner's manual lists 5w-30 as the correct weight motor oil. Any modern brand of motor oil should be fine. 5w30 oil for ZETEC engines
4.5 Quarts with oil/filter change.
No
We use Pennzoil 10W-30
PAG 46
located on the back of the base pan. Inspect base pan before changing oil, the base pan in the 2000 focus are known to rust out.