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The front oilcoolers, that were commonly used on German roads came either from AKG (handmade thick aluminum, reeeaaaaaally good quality) or from the Mercedes Benz (called Behr, ok, cheap but also good). We use 12mm (1/2" inner diameter) hoses to and from the cooler, together with either standard Type 4 pumps or HD Schadek/Melling units, that were blueprinted. A second oil piston pressure spring is used, on old Type 4 cases, the small front spring is exchanged with a HD unit. Type 1'e were equipped with two inner springs! They look pretty the same like the emergency brake spring inside the e-brake, but they are way harder! As we use on-block thermostatic units, the pressure srop, when the control is fully opened is high, so the second springs set the oil pressure up to a higher, more constant level! You'll come to similar problems with in-line thermostaitic units. That's it!
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