Have u checked ur oil level is ok, blue smoke normally means oil, / turbo , have u had a look around ur intercooler hoses to see if there’s any oil around them, when u get a split in the intercooler hoses ur normally get black smoke
Assume it’s all been serviced , plus what year is ur RRS plse
Best thing would be to get it plugged into diagnostics , can then see what the injector balance it
As a comparison here’s mine when I plugged my reader in
Assume the belts and oil pump have been done on urs