GSO is one of the thinner oils - but if you want to avoid EO, and need even *less* viscous - not the easiest to find, but apricot seed oil is one of the least viscous plant oils around. I've used it to make a test/tren/primo blend for a friend (he hates multiple injections) they were all enanthate, so nearly identical half-lives. It was pretty concentrated, so needed to add some BA/BB, but it didn't seem do need much, at around 125 mg/mL it might get away with either none or *virtually* none. *some* BA would be recommended just to maintain sterility, though.....
Doctor9