Just a thought maybe could be your piston rings
The answers you received sound accurate. Could be that oil return holes in head are plugged with sludge and the oil backs up. When you drop volume, you eliminate the back up and the leak slows down temporarily. Check out Aboutautomobile.com site. Select your vehicle and see NHTSA info and Consumer complaints and resolutions.
It is most likely the valve cover gasket . Very often hard to see that is actually coming from there. The gasket (large washer) needs replacing and sealing. If this continues leaking it will affect the seal around the thermostat housing and cause the rubber seal to fail and coolant to leak. May already have affected t-housing seal meaning it will leak after a while. Sorry
Ztec's are bad for valve cover gasket leaks. especially around the holes in the center.
SOURCE: ford focus turbo diesel low oil pressure with no knocks from engine
Possible oil sending unit problem.
SOURCE: 2008 ford focus
You need 4,6 qts of 5W-20 motor oil. If I were you I'd start right now to use synthetic oil. If you decide to do it - go with "The First in Synthetics" and the best: Amsoil! 5W-20 XL motor oil gives you (guaranteed) protection for 7.500 miles. (Do not fall for warranty cancellations or similar dealership spam. Magnuson-Moss act prohibts cancellations based on brand). Read this: http://people.msoe.edu/~yoderw/oilfilterstudy/oilfilterstudy.html or this: http://www.lesabret.com/filters/filter.html and try to avoid Fram filters. It seems that any other filter is better than Fram. I'd recommend Amsoil, Wix, Carquest (made by Wix), Mobil...
SOURCE: 2000 ford focus oil leak
Sounds like the valve cover gasket, clean off all the oil on the engine with a pressure washer or a steam cleaner and then drive it and recheck for the leak, that way you can pin it down for sure.
SOURCE: how many quarts of oil do i put in a 2000 ford
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.
Let me know if this helps,
Chip
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