Why can’t we use something like vegetable oil as a replacement for engine oil?

Question

Cooking oils also go to high temperatures. Do they expire before a synthetic would?

Edit:

Wasn’t wondering to make a substitute. It’s not an environmental or political question. Just wondering the *why* (:

Thanks so much to everyone who answered!

In: Chemistry

Answer 1

* most vegetable oils can’t withstand the temperatures in a car engine without breaking down
* there isn’t a great need, consumption of motor oil is low compared to gasoline, so it isn’t contributing to pollution and CO2 emissions they same way other fossil fuels do