OK, I have seen a lot of people saying that someone is running low on oil, 2 qt low in a 4 qt system or even 3 qt low in a 4 qt system. Is the low oil pressure light on the dashboard suppose to light up? How low will it light up? For instance, in my 86 Civic beater, I am sure the oil light is working, it light up when I start the enigne and off in 2 second or so, but I was running low oil(didn't even see an oil on the dipstick last time I check it, I check about once a month) and the low oil pressure light still didn't come on, why? Does anyone know how low is the oil before it will light off? I know it's probably deopends on the model and the brand, but in general, who know how it works?