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I have mp8 engine 2012 done around 800000 km same issues, collant overflow , i changed the injector cup ( they are leaking) but still have same issues . Now It very low amount collant overflowing. But could be another reason for loosing power and coolant overflow?? I have changed water pump, thermostat, air compressor, now injector cups ?? What could be next please??

I have mp8 engine 2012 , same issues, collant overflow , i changed the injector cup ( they are leaking) but still have same issues . Now It very low amount collant overflowing. But could be another reason for loosing power and coolant overflow?? I have changed water pump, thermostat, air compressor, now injector cups ?? What could be next please??

I have same issues, collant overflow , my mechanic change the injector cup ( they are leaking) but still have same issues . Now It very low amount collant overflowing. But could be another reason for loosing power and coolant overflow?? I have changed the water pump , thermostat, air compressor, now changed injector cup , still have same Problem overflow but low amount collant?? What could be next please??