I searched and didn't find anything on the subject.
Have been noticing lately when I check the oil level after I do oil change, the level is going down little by little. To be more specific- I had to change the oil pan due to striped threads on the oil pan drain hole last year around October/November. Started noticing the oil level going down ever since. I've been keeping an eye on the oil pan for any leaks and there is absolutely nothing- usually when oil is leaking it is noticeable- the oil pan will show the spots. The car has only 61K. I don't think it is burning oil.
I did an oil change back in April of this year and I have used the renaming half bottle as of today. The engine takes 4.5 quarts and it goes to the max level on the dipstick.
What could the reason be for the oil level to go down?

 

There are only a few reasons the oil level will drop, the oil is leaking, going out the tailpipe or into the cooling sytem. Place white posterboard or the like under the car/engine to check for any leaks and watch the exhaust when first started in the morning for signs of blue smoke.

 

I thought about exactly the same things- either leaking or burning oil. Every weekend I look under the car for any sign of oil around the oil pan or anywhere else.
I recently did the TB and did drain the coolant the filled it up with new honda coolant.
About blue smoke coming out from the exhaust- I looked for signs this morning- nothing.
I remember when I did the oil pan- the deal from Autozone was Mobil 1 oil with Bosch oil filter and the filter kept leaking oil because the seal on top of the filter was barely noticeable- I guess thats how Bosch filters are. Now I have Mobil 1 oil filter M1-104 and there is no leak.

 

Not to get off topic, and I hope you do find out what is going on, but I run Bosch Filters every single time (probably about the last 55k or so) and never had a problem with one. Again just my .02.

 

^ yes, I hear how great Bosch filters are all the time but for me for some reason, I had the worst experience. Kept tightening it and it didn't help- now with the M1-104 I have no problems