I just changed the oil and filter myself for the first time since I bought my used 1985 911 Carrera Cabriolet. I used only the lower drain plug and seemed to drain about the right amount of oil. The problem is that now I have virtually no oil pressure at all. Any magic (and hopefully simple) answer?

 

how much oil did you put back in? And you need to pull both drain plugs.

 

just retrace your steps and check the plugs and the filter....