For engines? No. We get engines exclusively from wrenching cars.
There is an important general point to made here, and it is the same one that needs made in every single thread where people report that gathering XYZ is OP and should be nerfed (e.g. when people where complaining about the shortage of Bones, and others were refuting those claims).
Please think of other players' situations before you make your "OP" claim.
As far as "slightly rare" basic supplies (such as Oil and Bones) goes, unless you are playing co-op with a large group and/or sharing a multiplayer server with several other people, please do NOT contribute to the "shortage of" threads. You are wrong, it is that simple. If you are playing solo, there is no shortage of anything, as you get all of that commodity in the world to yourself. Many of us have to share.