Important question to ask, i notice there are front strut bar and front anti roll bar. Which is more important ?

Hi guys, recently my Toyota Vios (NCP93) year 2012 will knock during acceleration but mainly during hot weather or climbing hill will notice more.  I had done general overhaul, washed injector, replaced new spark plug, new filter and visited few mechanic in my local area all seems no solution and changed to use RON97 but still the knocking never go away.  After general overhaul mechanic recommend me to use 10W40 and change every 5000k mileage.  Reason I perform general overhaul is because in the beginning I plan to perform top overhaul only but after the mechanic remove the top he suspected the piston do slap so he suggest general overhaul.  Before general overhaul there was a knocking too.

There is one mechanic told me this knocking happens to every NCP93(I believe is nonsense).

I wonder any NCP93 owner face the same issue as mine? 
Would highly appreciated any input from you guys.

Hi there, anyone here have any recommendations for a good mechanic for Vios NSP151 in Subang or Petaling Jaya area? No accident or anything like that, just want to find a good mechanic for regular maintenance outside of Toyota that might also a bit cheaper than going to official service center.