[Synchro909]

Unless you are a real stickler for originality, I'd install a filter. I have one on all of my 4 Model As which have been set up for long distance touring where help can be hundreds of miles away.
All that crud people are talking about in the oil is removed and although one might cast a few $, it works out cheaper in the long run, either by extending your oil change intervals or by increasing the life of the engine - likely both.