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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."
they are shimmed ,and difficulñt to do unless you know what your doing ,but 10 - 12 inlet and 14-16 exhaust will suffice ,repeat these engines are shimmed which is a difficult procedure for a weekend mechanic
2003 FORD FOCUS 2.0L 4-cyl Engine Code  Engine Oil Grade 1......API* All TEMPS......SAE 5W-20, Engine, with new oil filter 4.3 liters. Thank you for using fixya and good luckOil Drain Plug.....17ft/lbs Torque
ford focus zetec engine 1.6 ,then its quite easy to do but one word of caution ??BIG TIME and the the bottom pulley is not on a keyway just a slight taper so do not undo the bottom pulley bolt by jamming a big bar with socket on and turning the starter motor ,as the bolt loosens the timing belt pulley moves and the valves hit the pistons .jam the flywheel up with a small jemmy bar in the flywheel teeth by removing the starter motor,trust me on this i smashed two pistons and 6 valves undoing the pulley bolt with the starter motor
all Zetec engines (2.0 DOHC) are NOT interference engines. There are deep reliefs cut into the top of the piston to clear the valves when they are fully extended. There will be no valve damage if the timing belt breaks on a Zetec engine.
your engine code means "big leak" in the evap control system, this system has alot of pieces, but you are looking for a vacuum leak most probably, look at your vacuum hoses, and refer to the vacuum diagram stuck under your hood for routing, see if you have a bad hose, or disconnected hose some where. these are small vacuum hoses that attach to the purge valve, air filter housing, and charcoal cannister. let me know what you find.
The first Zetec engine appeared in 1992, powering the fourth generation of the European Ford Escort and Orion. It was codenamed as the "Zeta" engine before Italian car maker Lancia threatened to sue Ford for trademark infringement as it already owned the name. Ford hurriedly renamed the engine "Zetec".
Early versions of the engine (prior to mid 1998) came complete with self-adjusting hydraulic valves. This helped prevent the notorious valve tapping (on the CVH) but caused other issues. The biggest problem was that a special Ford formulation of oil was required otherwise the valves tended to stick. Similarly, failure to regularly rev the engine above 4000 rpm also led to valve sticking. For these reasons, conventional tappets with shims were introduced in 1998.
Hope this shed some light on you r deli ma Let me know MrRodneyLong@gmail.com