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!
Upcoming comedy shows: March 3 at Broadway Comedy Club, NYC, 8 p.m. March 5, Tierney's Tavern, Montclair, NJ, 7:30 p.m. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!