It is clear that cars with automatic transmissions cannot be towed with any drive wheels on the ground, engine off, in neutral, because the torque converter powers the lubrication pump for the transmission.
Why is it considered safe for a manual transmission? Doesn't the transmission need to be lubricated and cooled, just like an automatic? What about the differential or all the other parts of the car that move while being towed? Don't they need to be properly lubricated too? What is the technical reason behind this?
I thought that for a manual transmission in neutral, the output shaft does not spin the layshaft, which in turn does not spin the crankshaft, otherwise the entire powertrain would be 'closed' or 'connected', so how is it possible that splash lubrication is occurring at the bottom of the sump?
Why was the method for supplying lubrication to an automatic transmission engineered differently compared to a manual transmission?