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I do the oil myself every few thousand miles, but yeah I'll do a flush with the injectors and see if it comes back.
Looks like injectors are an easy enough job so I'll give some remans a try with another oil change to see if that resolves it. Will update post...
I have an 02' Prius with 200K miles and the oil smells like gas. I first noticed this at ~180K and have changed the oil several times since then...