Why change oil of hybrid car at 5000???
Should be minimum 10,000 for the weak hearted and 15,000 for people with strong nerves.
Dusty atmosphere??? If you are using a genuine oem air filter, its only job is to filter the air and let only clean air enter the engine, the dusty atmosphere should affect the air filter not the engine. If you are using guard or any chinese junk, then you should worry about dusty atmosphere.