Just signed up with "the oil guy". I have a 2003 VW Passat 1.8 turbo and I am worried about this sludge issue. I just checked in the oil pan and valve cover gasket and everything looks clean, but I have been running dino oil
and changing avery 3 to 5K. So far the car has been great and I haven't had any performance issues. I just switched to M1 0w30 full synthetic and plan to change again in 1K with the large filter that was recommended on this site. My question is; Where do I measure the oil pressure, and is oil pressure a good indicator of sludge clogging the pump intake screen?