Just back from the 'Ring and I'm scouring for info on 4 cyl oil pumps. I have been occasionally seeing oil starvation on right handers with quick transition, throwing oil across the sump. I have a Schrick baffled sump and windage tray, and am concerned that the Schrick isn't doing its job, or that the pump isn't the right one for the depth of the sump. So, my questions are: 1) How many 4-cyl oil pumps are there? (by part no) 2) Do the pick up pipe depths differ? (eg ABF pumps) 3) Are they all interchangeable? (ignoring sump depth) 4) Is there one pump which is higher pressure than the rest (Passat TDI springs to mind, but hazy recollection).