07 V6 AWD and im at 211K. Regular Synthetic 5W-20 Heavy Duty oil changes. 1st round replacements are valve cover gaskets, spark plug seals, cam seal, alternator, radiator, AC Condenser, all 4 wheel bearings, all 4 control arms, both tie rod ends, upper radiator hose. 2nd round replacements are all 4 brake rotors, spark plugs, and battery. Ive done all LED bulb replacements with no CANBUS error codes in dash. Tranny still pulls hard. Retorqued the cam cap bolts when i did the valve cover gaskets. Also, ive regreased the ball joints, cv joints, and guide pins on the brake calipers several times with hi temp water resistant grease.
Cars been rear ended while i was on my way to work and insurance totaled it but i refuse to stop driving it because its such a champ of a car.
Its got a very slow oil drip coming from the timing chain cover but its not a big deal. I LOVE this car.
Here
https://greencountryoffroad.com/chemicals-fluids/oil-for-ford-focus-diesel you can know more information about best oil for focus.