I run 20w50 and when the engine is very hot I get 1 bar at idle. But I use an OEM filter from the dealer now; when I had a Fram on there previously, pressure at idle was only about .3 bar and the gauge would peg at only 2.5 to 2.75. Took the Fram out, and everything bas back to normal. Scary stuff!

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280