Changed the oil on our 2005 330i yesterday. Car has 63K miles on it and oil was changed at 1K, 15K, 30K, 45K, 50K, 56K, and now 63K. The car has never consumed any oil but is often driven only short distances. The oil that came out of the engine looked normal as did the oil filter and the insides of the oil filter housing. However, when I was pouring in the new oil I noticed that the inside of the oil filler cap had a slight gummy redish brown coating on it as did the inside of the valve cover around the cap. But, when I looked down the inside of the valve cover everything looked normal - shiney aluminum with a coating of oil. Since there is a shield under the cap to prevent the valve train from throwing oil at the cap, it almost seems like air/oil vapors mixed with dirt were forming around the cap and any place where oil would not wash it away. There's not much of this redish brown gummy stuff but I wasn't expecting to see any. Anyone know what's going on here?