ከፊል-ሠራሽ እና ውህድ ዘይቶች የተሠሩት ልዩ ንብረቶችን ከሚሰ sophisticatedቸው የተራቀቁ ኬሚካዊ ሂደቶች ጋር ባልተለመዱ መሠረቶች ነው ።
Semi-synthetic and synthetic oils are made from non-conventional bases using sophisticated chemical processes which confer special properties to the finished product.