Thank you for the correction, I thought it was okay to use the same compound all around. I've used the blue Hylomar before and it worked fine but maybe that was just luck. So you use The Right Stuff and Hylomar for this repair? Seems to me that they would get mixed together at the corners and that could cause problems. Have you tried using just The Right Stuff on the rubber U gasket and the metal flanges? The Hylomar does say it works on pressure flanges.

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89 300te 222,222
92 300e 190,000