99.9% of users seem to manage to post questions without selecting just one of the sexes. It can be guys ( in the modern parlance , meaning a group of people of both sexes), folks, people or anything else that doesn't, quite obviously, exclude one sex. It can even be without any of those, as in 'Hi wondering if someone/anybody can help', but the continued use of 'gents' just stinks of sexism/mysogyny. Which, 90% of the members of this site manage to not be.
It is a very old fashioned , almost Victorian , attitude that only men work on , or have an interest in, cars. So just wondering if the op is doing the gents thing without thinking because he is very old, or if he is doing it deliberately.
Addit: No black marks, it has been erased under to rehab of offenders guidelines