Hot oil take less pressure to push through the motor. Cold oil takes more pressure to push through the motor. Look at the oil gauge in your own vehicle on a cold morning, works just the same.
In the summer I will run heavier oil to keep the pressure up while under load and lighten up in the winter to save starving the motor on startup.
Heavier oil gives me the false sense of security that my 50 yr old tractor still runs like a new one.
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