Hello George,
Normally the tube is a tight press fit. Depending on the model there are various configurations. They all should have some kind of support bracket attached to the tube to keep it from vibrating and coming loose at the oil pan. You can try using a good sealer like Permatex. Use the original formula, not the silicone. I would use the "hard setting #1 " in this case. Use a good solvent to clean oil from both surfaces before installation.