Again if you actually look up the viscosity at 40 and 100 C they aren't much different - so that isn't why the pumps are failing.
Aggressive throttle on cold oil *may* be a contributor. I always make sure the oil is up to temp before getting hard on the gas
https://www.mobil.com/en-gu/passenge...x-mobil-1-0w40
https://www.mobil.com/en-us/passenge...x-mobil-1-5w30