There is nothing that makes it any more unsafe than mixing strong opioids with long lasting unknown stimulants in general. Simple dosing "is this dangerous" questions belong in BDD but there is nothing anyone else is going to be able to tell you. The less you take the safer it is.
Indeed, yes MDPV is what I mean, sorry. So, for future reference, the combo of "bath salts" and oxycontin seems ok to me. I took 20 mgs of oxy on top of two very small lines of salts. This is my 2nd time with the mdpv, and found it to be super intense. Almost too much for me, and I've had lots of experience with cocaine and smoking crack.
Exactly. Little is known about MDPV so you're taking a risk by mixing it but the basic risk is the same risk that somebody who combined amphetamine, methamphetamine, or cocaine with another strong opiate.
Because that's really the final answer, I'm going to close this. Leaving it open would really just lead to speculation.
Feel free to write a Trip Report after all your experiences with that combination, though!