Braided oil cooler lines for Pre-1992 engines on Minis with the pre-engaged starters. These engines had the block union as 5/8" UNF andd the 1/4" NPT filter head. Block hose is 15" and filter hose is 22".
The correct running temperature of the oil is perhaps even more important than the water/coolant temperatures - so let us consider how to control them. Mainly because it seems to be the most misunderstood of the whole process, and oil cooler fitment almost a reflex when over-heating occurs where a tuned engine of any type is concerned. And in many cases on standard production road cars for that matter.