I posted awhile back about my 09 Nissan 2.5 using oil and always has. I have always ran 5w30, all variety but mostly synthetic. At the advice of some members I opted to use 10-30, (M1HM). I'm a hair less than 500 miles on this oil and the car has burnt a half quart. The 5-30 usually used, give or take 3/4 to a quart every 1-1500k. I'm stumped?