Opioids Mixing oxycodone with morphine?

[curiosity]

Usually my initial dose for oxycodone is 25mg but I usually take another 15 mg dose less then an hour afterwards to prolong the buzz, fortunately oxycodone is very scarce where I am, but i'm down to my last 25mgs probably for a long time before I run into more and was wondering if morphine could help to prolong and maybe even boost the buzz, I find morphine on it's own to be kind of boring though, and one dose of oxycodone will just be dissapointing due to it's short duration, i'll also be taking dimenhydranate as a potentiator, I was also wondering about if nyquil might be a better potentiator then dimenhydranate since it has both dxm and doxylamine in it