Cars Q&A

Hi I have a pulsar 180 dtsi 2007 model can you suggest me where i can give it for servicing in chennai as i heard here all the bajaj service station people will replace the original parts with duplicate parts and they will do only water wash.and recently i have given it for service in castrol byke zone in Nelson manichyam road kandy raja castrol byke zone chennai from that time my byke doesnt have a good pickup in 3rd,4th,5th gears and it is giving only 30 milage PL.and here iam unable to get 20W/50W engine oil which is suggested fr my byke so iam using 20/40 castrol power engine oil please give your valuable suggestions on all my above questions.Thank you.