There's always blue loctite. If it's sealed/not leaking, loctite should do the trick...and also, you might check the torque specs on it...and remember with loctite, you'd need less torque as wet, it's a lubricant.
GL...sorry I just skimmed and offered that hose suggestion!
I'm so depressed. No one wants to come see me. :(
Mangofy your E46!