Hello, how much oil got into the cylinder(s)? If it was just a small amount don't worry about it. Start the vehicle and this will burn off the oil in a couple minutes. We actually put oil into cylinders sometimes when addressing a compression issue. If a cylinder comes up low on a compression test, we can add a little bit of oil in the cylinder, and it will seal up the piston ring. This way we can tell if the compression loss is due to worn piston rings or if it is a valve issue. So as long as it wasn't a lot of oil, you should be fine. If it was a leaking valve cover seal, the o rings that seal the spark plug area, it most likely wasn't more than a teaspoon of oil. You will want to replace those seals, but you should be ok on starting the engine. It might smoke for a second out the tail pipe, but won't do any lasting damage.
https://www.2carpros.com/articles/how-to-test-engine-compression
Jan 16, 2023 at 9:00 AM