I don’t know definitively, but I believe there is some overlap in perceived “petrol” and “skunk”. There is a paper published in the ACS a few years ago that quantitatively and qualitatively supports thiols and thioethers/disulfides as responsible for the “skunky” smell of tested cannabis cultivars.
I don’t know about most “skunky” yet, my stuff just started flowering. But I can say nothing I am running right now is remotely fruity. All BO, dirty laundry, pungent, and skunky. Sounds gross, but I love it!
Look at these beautiful Maruf black leaves growing in a solo cup (suspected male)! Pungent stem rub, similar to the Thousand Oaks f5 male.
View attachment 1330278