When accelerating at 1st gear, when the rpms reach around 5-6000 it doesn't sound too good. Does anyone else notice this? It doesn't seem smooth to me and sounds like the engine is ruffing it. I did baby it the first 1000KM with varying rpms, so not sure what the problem is... i'm about to change my oil to synthetic mobile 1 tomorrow.. so not sure if that'll help.