I have a 2003 Accord, 4 cycl, Auto. I have always stayed on top of my oil changes and most of the maintenance for the 1st 4 years. About 8 months ago, I noticed the oil light on as I was leaving for work - drove directly to Honda as I still have at least 1000 K before I was due for next change...it was nearly empty...I was pissed. I switched to a different service provider....a little while later - same thing. It does not leak oil, it does not burn blue but it uses oil. I watch it and add oil myself as necessary. In the past 2 months it has started shifting oddly....meaning, it seems to shift down when coasting, probably normal, but I may accellerate and it shifts up noticeably...I think it is just that I am noticing it because it is not smooth. Took it to another mechanic to check timing, spark plugs etc. He suggested, and did, an engine treatmeant on it noting a lot of soot build up in the tail pipe....felt maybe the oxygen sensor was off and it was adding too much ??, making it burn too much oil - you got me? Any thoughts, help, similar problems - all info appreciated?? Just to add it is in year 6, has 248K....was expecting to 450K. Mechanic indicates that if engine treatment doesn't work, it is likley a big engine job...basically an engine re-build, replacement.