Coolant drain plug-engine

[Kristophe]

Mercy.... is it just me or is the coolant drain plug on the block impossible to get a socket to on a 3.0? I've searched and read several posts about coolant change but no one seemed to be unable to drain the block in addition to the radiator. I did remove the right tire but even with over 23 inches of extensions I can't gain straightaway access. How much coolant is really in the block and is it necessary to drain also? I bought BMW coolant and since I'm not the original owner I want to make sure the truck has the proper coolant and maintenance. And who knows when the last change was.

Thanks guys