Harold, According to the 2002 Ford Focus Owner manual,
With engine oil filter change : 2.0 liter SPI engine takes ( 3.78 liters / 4.0 U.S. quarts of 5W-20 )
2.0 liter Zetec engine takes ( 4.25 liters / 4.5 U.S. quarts of 5W-20 )
links below talk more about what they think oil should be used. "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Depending on what engine this is, you should drain oil, change filter, add 3.75 qts of oil, then start engine to check for leaks. Turn engine off, then check the oil fill on the dipstick. Add to proper amount generally at 4 or 4.25 qts.
To my knowledge, a 2003 Ford Focus 2.0 SPi engine would need 4 quarts of engine oil (roughly 3.78 liters). Incidentally, the Ford/Cosworth Zeta/Zetec engine would be needing 4.25 quarts (~4 liters).
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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