Some seed oils, including peanut and sesame, are also sold in unrefined or partly refined form.
有些种籽油，包括花生油和芝麻油，也会以非精制或不完全精制油的形式出售。
3
A further advantage is that unmodified oils from plants, like the peanut oil used by Diesel in the 19th century, have high viscosity and require engine alterations.