icanfixall
Official GMM hand model
If the gromet is that old then replace it. Your this far into the job and no good reason to half @ss it with a bad gromet. I know they might be hard to find but now is the best and easiest time to replace it. The turbo drain line needs to slide thru this gromet so placing the rtv on the end of the drain tube will get it on the gromet. So the gromet needs to be clean. No amount of rtv will seal the oily gromet. Banks sells gromets for their turbos still but I don't recall what size you need for your turbo. All the valley pan holes for the gromets are the same outside diameters. Maybe Russ (Typ4) has some gromets. I know there has been some supply issues with some gromets too...