Went and looked on the net for food grade oil, and then for the new greenie chainsaw bar and chain oils Biodegradable.
First there are few companies that "Package for resale the oil"
Most buy from a company that makes it and blends it for everybody and anybody that will pay for it.
From looking at more than 6 Bio (greenie) friendly chain and bar oils.
All of the base oils are non toxic blends of mineral or plant oils (vegetable oils) 40% to 60%
The tackifiers are added are also non toxic,non hazardous. Which means they don't have to be specific on their blends of the oils. That they post in the MSDS (Material Safety Data Sheets)
Since the doctors/hospitals known how to treat for overdoses of cooking oils etc. there isn't any details.
So from the point of view of the chain saw oiler pump and using vegetable oil type and flavor is up to you. As long as it is clean and free from bits of cooked material. The saw,bar and chain will not care!
If it is a manual type finger/thumb pump, you may have to pump it more often. Or you can use one of these to squirt oil on the bar and chain, if you are worried.
Granted my factory small engine and equipment training was almost 30 years ago. But the biggest thing that the instructors would hammer home is any clean lubrication is better than no lubrication.
Which I found out is still true toady as it was then. People don't read the instruction even on the quick start sheets. Guy bought a lawn mower didn't put any oil in it. Filled it with gas and seized it up pretty quick. He claims he didn't know they don't leave the oil in after testing :doh:
So as been said in the previous posts use your chose of cooking oil. And if you are a little worried you can always snatch and spray a nice even coating of pam or other non stick spray on the bar guides, chain, sprocket and roller on the bar tip. In addition to the oil. Plus the chops and ribs won't end up smelling like the speedy lube!
:thumb: