Today, I went for a driveshaft rubber cover change for Myvi 1.3 manual. But the shop says that to change it, you must pour out all the gearbox oil before you can proceed. Is this really necessary or not? Because last time my Wira 4G15 went for a drive shaft change and my mechanic did not even pour out the gearbox oil.

For the Myvi, I think the gearbox oil is due. The last major repair of the car would be repair from insurance agent mechanic at KL. That time my aunt crashed the car during middle of 2014. I think this insurance agent mechanic swapped out the wrong sized camber bolt to the car. 
