Low oil pressure makes me nervous

Totally Off-Topic: have you guys ever heard of REALLY high-viscosity oils?
In locomotive steam engines, they used 600-weight "steam oil". It closely resembles molasses, and pours like it. The rod-to-crank clearance in a locomotive engine was in the range of .01"; don't know why the clearances were so large.
In antique car transmissions using straight-cut, non-synchro gears, they used what is now generically called "LUB 134": 1600-weight! This was because the viscosity of the oil would tend to bring the countershaft gears up to the same speed as the main shaft, in order to minimize clashing, parasitic losses be damned! That LUB134 will hardly pour at room temperature.