I meet this guy through a friend the other day. He has a 05 X5 4.4 that he Dinaned chipped with a cold air intake. He has 220,000 miles on it and it doesn't use a drop of oil in between oil changes. I said really, because so many people have had valve seal problems. He told me that he changes his oil very 5k and only uses 40w synthetic, he couldn't remember what brand. It doesn't leak oil ether. We live in CA where the weather is mild to hot. I did ask him if he takes it to the snow and if it starts slow in cold weather, he said "nope, runs great".

So my question is, anyone else doing this? He's be doing this for a long time and had a positive affect it would seem.