City idsi engine does not give smoke from silencer, but when I open the black button type thing (something OIL...) is written in the engine, it gives smoke,
one mechanic said my rings are finished, and i had to change the Assembly and he said to swap 1500 vtech as soon as possible.
on cng it gives missing (jerks) sometime but speed is ok, and petrol its very good.
Please suggest, is the engine really weak, if yes then why it is not producing smoke from silencer, and should I go for overhaul, ring replacement or engine swap. please also give some price idea of all options.