2000 Ford Festiva

Engine Mechanical problem
2000 Ford Festiva Engine Size unknown Two Wheel Drive Manual 36000 miles

my car is a fiesta zetecs I am using alot of oil (1 l a week)
it is not blowing out blue smoke and is not leaking out anywhere!I have just put in a medium oil to see if that works as the other one may have been to thin for it?
do you no what the problem is?
March 25, 2008.

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