Probably more for looks than cooling, but makes the Frantz look different - some will like it, some won't - I use one on both the oil bypass in the foreground, and also on the Frantz fuel filter on the other side of the engine bay.
Available from
Frantz Filters Manufactured by We Filter It! Inc - Oil, Diesel and Gas Filters
Anyone interested should mention the TDR for a possible discount, or mention my name. (
NO, I don't get any commission! 
)