Yeah, oil pressure seems decent without an oil cooler.
My 190 2.5turbo (before when my oil cooler lines were looped with heater hose(yikes)),
When I'd pull off the interstate running 79mph and sitting at the red light, my oil pressure would float around under 1 bar.
Now that I've got a little an10 stack plate oil cooler, even when my spotty a/c system gets my coolant temp levels around 100C, it will maintain 1.3/6 ish bar even after ripping on the highway.
I changed the oil early since I figured it must have been "cooked" by the excess temps it saw during that time with no oil cooler

__________________
97 e300d, 78 300Dt, 95 E300d, 94 E320 estate