Hyundai head: Justifying its decision to go only for petrol version of its Santro car, Hyundai Motor India Ltd (HMIL) yesterday claimed that diesel engines are not fit for small cars since they generate lot of hear and vibration. "Diesel engines are not a fit case for small cars. They reduce driving comfort by giving jerks while driving, besides having several other disadvantages.We did not introduce a diesel version of our Santro model due to these reasons," J H Kim, executive director, Hyundai Motor India Ltd, said.