You dont just have to use minetal oil, any oil that protects steel from rusting can be used. I personally use Balistol. It can be found on amazon cheaply and can be used on just about anything from steal, wood, leather even animals coats. It is medical pure white oil so it doesn't have to be wiped of your razor if you've stropped before oiling. The smallest bottle will last years, I have the 15ml pen applicator that ive been using for at least 2 years and its still going strong.