Please be clear that the only proper way to achieve full flow on the VW is to take the oil directly from the (plugged) pump, drill and tap the case and return it directly back into the main oil gallery. Filters mounted at the original oil cooler location will bypass all the time. These are called bypass filters and/or coolers. The more restriction at this cooler location the more the oil is bypassed to the engine and the less to the cooler/filter. All other pump/filters or covers that take the oil out and return the oil in the pump, either restrict or bypass so only part or far less of the oil is circulated through the filter or engine and/or other cooler. We continually receive reports of failure caused by suck type filtering (rather than properly done pressurized) that restrict the flow badly, and that is why we never sell them. |