my car 2007 , oil full when i bought may /08 ... 1 month later normal driving amounts it required 1/4 bottle . then from end of may for next 2 months it required 1/2 bottle of oil. so looks like about 1/4 bottle per month is this normal for N/A 3800 series III. there's no smell or sign of leaking or buring oil. the weather has be humid , damp hot , cool at times at night since we bought it.