The gears are stationary but your primary shaft, the one connected to your driveline, is still turning. It has bearings that need to be lubricated and the transmission is not pressure lubed but rather splash lubed by the gears.:thumbup:gokcer said:I dont see any reason why it would be unsafe. If gears are stationery; then they dont need to be lubricated. We have hydrolic brakes so neutral has nothing to do with braking.
If you were driving a truck which uses air brakes and needs certain air pressure to operate then it would be a problem. I think air tanks are charged by air pump running of the engine. If the engine is at idle while in nutral, air pump might not pump enough air to keep the tank pressurized and you loose brakes. But in a modern car that is not a problem.