Date registered: Jul 2008
Vehicle: 1992 190E 2.6 1981 Cadillac Sedan DeVille (SOLD)
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
Well, yeah (New O-Ring > duct tape)
Duct tape will help absolutely nothing on holding 15-20 psi pressure. You will be better off driving with the cap removed so the pressure will not build up. Summer is over, so not likely your engine will go over 100C.
That was never the plan I duct taped it to slow down the loss until I could get a new O-Ring from the mechanic, which I just have.