1) which one is the best oil cooler for hd heritage softal classic

2) which one is best , is it oil cooler only or oil cooler with fan

3) if we installed oil cooler or oil cooler with fan , is it required an engine cooling fan additional to reduce the heat

 

Valid question, do a search in the threads here in the forum. Will give you loads of readily available information. This topic has been addressed multiple times. Even now, there is a thread going on over the Oilbud.