Oil Cooler line connections: Use Teflon tape?

[Excaliber]

I have often seen the teflon sealer used on fittings where it is completely worthless, downright stupid you might say. If it's not a pipe thread application and employees a flair or an O ring for the seal your wasting your time thinking sealing tape is going to do anything. If the flair/O ring leaks, the fitting will leak, period. Fuel line into a carb is a classic example, stupid because it might allow a bit of the sealer to enter the carb and dang sure won't stop a fuel leak if the fitting is loose, thats a flair type seal (in most cases).