170cv 1.4MA is holding in on higher KM/H's

Oem oil filter is good. It's made by Bosch! The very important thing in this engine is the oil. It should respect Fiat requiremements called "FIAT 9.55535-S2*"

Order only the selenia multiair (k pe) 5w40 to stay safe...it was used in engine development and its well-known that other oil brand (even with same grad) could damage this engine
 
I suggest bardhal motor oil! Before putting the new oil clean the circuit with additives such as liquimoli