RPM goes over 2.5 @ 120 KM/hr, is it normal? on 2003 Honda Accord

I changed gear oil by (honda oil ) and also changed the oil filter.
I notice RPM goes over 2.5 @ 120 KM/hr, reach to 3 and stick there , without any increament motor sound.
is it normal???
thank you

Asked by for the 2003 Honda Accord
scan for codes and post so we can adv
1 more answer , 1 more comment
Gear oil? Manual trans?
Gear oil ( transmission oil)
it is automatic gearbox (automatic transmission)