You don't have to use bleach!
Hi. Recently I discovered how to get oils...synthetic or otherwise out of clothes.
Bleach is not the best choice.
The best choice is some kind of degreaser like a mainstream dishwashing soap (the natural kinds have plant degreasers which only work on organic ingredients). For all other kinds of grease...make a hot water/soapy solution...brush it into the stain, maybe add some more degreaser in the wash and it will come out.
No need to use bleach.