Even though the engines in my Benzes are diesels, they have the same oil pressure gauges. When fully warmed up the oil pressure will, at idle in park, be at 1.5 bar. There have been times when even after driving on the highway, the oil pressure only went down to about 1.8-2 bar. As soon as the rpms get to 1200 the oil pressure hits 3 bar.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section