Scaling in object level mode will cause a lot of problems down the road. This tutorial explains why and how to overcome it.
In this short 3ds max tips video I will show you why you should avoid using scale in object level mode and how to overcome this if you need to scale an object. There are at least two reasons why you should avoid scaling in object level: First it will break the measurement of polygon modeling tools. And second it will break your hierarchy animation when you create mechanical rig.