it ' s possible that it was underfilled , but corporate oilchange places have lots of checks to keep this from happening . more likely you burned it in normal driving from a bad ring or valve guide . you probably didn ' t cause any damage if the oil light never came on , but you never know . more likely to happen is overheating the oil leading to sludging , but that ' s also very dependent on the engine . all you can do is fix the issues as they appear . the dipstick read higher on a slope because that orientation made the oil run towards the dipstick . you should get in the habit of checking your oil level every time you get gas . knowing how much oil you ' re using is useful in figuring out where its going . <| sep |> Holy shit , just stop moving your fingers about your keyboard .