I have an 06 STS with the V6. The car now has 44k miles on it, and I noticed that it seems to be using oil. I just changed the oil 3k miles ago using the proper Mobil 1, and the dipstick now shows that I'm getting close to the bottom of the usable range (hash marks / holes). Has anyone experienced this on their V6, and what was the fix? I'm still in base warranty as well as having the extended coverage. I would think that the engine should be able to complete a normal drain without adding much oil. We have the same engine in my Wife's SRX and it doesn't seem to use much oil if any, and it has 78k miles on it now. Any help would be appreciated!