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Update - two nights ago I pulled to pipe off to inspect the thing internally and assess the risk that it might become a gusher leak on the DGRR trip. Good news is it looks like the brazed joint between the pipe & flange appears solid. Put the flange in a vise and tried deflecting the elbow relative to the flange by twisting it and pushing/pulling, and couldn't get it to budge. The inside of the elbow and joint with the flange looks to be corrosion free & clean. Should have taken some pictures. Anyway, I put it back on the car with a new gasket & RTV, and after making sure everything was cleaned up, I let the car idle on the jack stands for about 30 minutes - no oil leaking after all that time. So yesterday I decided to use the car to commute to work (50 mile round trip, plus a few miles out for lunch), and took another look underneath when I got home. There was a hint of an oil film starting to form on that same spot on the elbow, but it hasn't quite become a drop yet. So with frequent dipstick checks and a few extra quarts of oil onboard, I think the DGRR trip will be a low risk proposition.
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