Should I be using locktite on all the bolts???

[240diowa]

I have a '74 240D which has a 220 motor. I have had alt. braket bolts come loose and break. I had some bolts on the front part of the motor come out and it was blowing oil out. I put in new bolts and now some of them have come loose and/or broken. The motor has great compression and runs great. Should I be putting locktite on all the bolts or is there something I should be looking for that is causing the vibration?