I've had to jump other cars with my 300E with no problems...
And you don't need to "protect" your OVP...that's the job IT IS supposed to do for you!
But I start by connecting the negative lead to the dead battery to a ground source on your car (not the battery).
Then the positive lead on your battery to the positive lead on the dead battery.
Disconnect in the reverse manner as you connected.
I'm sure others might question this procedure, but it has worked for me with no ill effects.
BTW, I have some serious jumper cables (you could attach these to a Lincoln arc welder). The crappy ones aren't stout enough to provide the charge needed for a completely dead battery...
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car