The other night i noticed that at idle i was burning a little oil and the oil pressure was a little low. i checked the oil level and it was acceptable level but i did add a little bit more. After i did this my oil pressure went back to normal. i drove a bout 60 miles that day and now my oil pressure low again. check the oil level and its the same level as when i added oil. Im not sure what going on and i would like any help thanks.