Found on line:

Quote:

Q: What is the difference between Varsol® and regular Paint Thinner?

A: Regular Paint Thinner is a "generic" brand of thinner while Varsol® carries a guarantee of purity. As a result, Paint Thinner is usually less expensive than Varsol® but can be used for many of the same applications.


So, it's safe to say that Mystery oil is one part thinner to 2.3 parts oil.