I couldn't resist posting this pic Andy sent me of his way cool "Hippy Chief" on its way back from the International Indian Rally in July.
This is Andy's first Indian, and he got it going as well as it looks (or a lot better, depending on your perspective on shine vs. patina!) with IPE as consultant/help line/supplier of parts. If you see him on the road, ask him what he thinks of the help he got from IPE.
Anyway, clean engines do run - and last - better, so it is a good idea to clean your oil tank once in a while, and fit an oil filter.
IPE has two options for that. A simple and inexpensive filter that just slides over the return tube inside the oil tank, and a more elaborate setup that takes standard screw-on filters. Both of these are well proven solutions to keeping your Indian engine oil clean. See them here.