Actually both my connectors are the same size and thread, but one of the metal lines is thicker than the other. The larger line which someone told me is the low pressure fill line is blocked by the oil cooler line. The smaller line (same thread) is easy to connect the fill hose to but the same person said that smaller lines are high pressure so not to fill there. What I am trying to find out is this true even on older cars where the fittings are the same size? Also is everyone else's also blocked by the oil cooler line?
Marc