I just had my car serviced today, and my mechanic mentioned that canola oil was invented (or originally used) as a form of motor oil. Is it true that the canola oil we use in the kitchen is the same as an oil that's been marketed as a motor oil?
Canola is variant of rapeseed "genetically modified" (see comments) through artificial selection techniques.
Rapeseed appears to have been used as a motor oil:
However, canola was bred in the 1970s by Richard Keith Downey and his team for the nutritional value of its oil (i.e. it was edible, unlike the original rapeseed oil!).