Car feels heavy and sluggish after 4500-5000rpm
I have a 2002 147 1.6 and car has clocked 83,000km. Timing belt & variator(diesel sound) have been changed during the 80,000km service.
Recently, I've noticed that the car feels slugish and difficult to hit high RPM from 3rd gear onwards. The RPM goes up very slowly(from 5000onwards). Seems to be flat at 5000-5500 rpm. I had to drag the car longer for it to reach 7000rpm, seems like eternity...
The only thing that is different this time round is the engine oil. I've been using Selenia 20k(10w/40) since day 1 and my last service(80,000km) I had changed to Castrol Edge Sport(10w/60). Can the engine oil be the culprit or there is something else that I need to be worried off?