My Mondeo is killing my mind, only problems!!!!

Hi I’ve run fat problems with my Mondeo Bj end 94 1.8 L, 16 V,172000!!! 1. Extreme sprit consumption of 12 l in city traffic on the train about 9-10 L. 2. Heavy cracking noises front when i zb in 30 zone at uneven road driving, 2 workshops and Tüv (used car check) mean it’s all solid and in order. Now I bought before 3 Mon shock absorber from Gabriel (Ebay) ,built in , and have now whistled and swinged front of the finest. nu salesman has me new sc hicks ,üblege echst ihre einbauten , has someone experience with Ebay gabriel shock absorber????? 3. When I start zb in the morning the engine Bitter runs round , after 1-2 km now again better almost round , 4. And the hammer beats , when coupling from 1 to the 2 course Quitsch noises , and still raised again while switching ,(does not overdo clean clean ). 5. performance real schmies…. autobahn from 100 to 180 kmh turb creeping slowly , Have air filters , candles, spark plugs , Fuel filter made new, no reinforcement, throttle valve cleaned, air flow meters incl wires are clean( looks white ), What kind of oil do you recommend to me atu and for my 5W30 , bought the car a year ago from the backyard dealer and filled in 15 W40 Are there any problems if I jett zb 5W40 with filter change???? Please To HIILLFFFEEEEEE Would be cool and nice if someone could give tips and tricks to every single point to fix these errors. Thanks in advance for every time eHelp very grateful