Mr Scotty,I want to ask you a very serious question for me. I've been using my Perodua Kancil 850cc for the past 8 years. And it have been 3 years my car have a gearbox problem. On a first until forth gear it was smooth.But when i change into fifth gear,my car have a whining sound.I did change my gear oil,but it still the same. How can i fix that? It would be helpful for me if you answer my question.