Timing chain tensioner, there are posts on this, I replaced mine and it continues to slowly weep oil. Most 1ZZ engines do this unfortunately. Not a cause for panic and easy to fix. In my case try to fix. I don't lose oil between changes though.
I'm not burning it i don't believe. I its a very small amount. I but enough that it's wet under that plate and only seems to be coming from that plate. I ill look up the post on here for it and educate myself.
The pre cats are actually being replaced this weekend!
Just gut em. They are evil. Replacing seal will slow the leak down. There is a procedure to reset the tensioner that is important, I believe turning the crank via crank pulley bolt. Can't remember whether it's clockwise or counter, turn till you hear it click.