Responding to critics, Dr Mahathir Mohamad revealed that he was the chief test driver for all the models produced by Proton.

The 92-year-old politician also claimed that he had driven Proton cars on the windy roads to Genting Highlands, a popular resort with an average elevation of 1,740m.

Critics accused Mahathir of kicking up a fuss over Chinese firm Geely Automobile Holding Ltd acquiring a 49.9 percent stake in Proton from DRB-Hicom when he did not use the national car himself...