@dookingcheekun
My brother had the same problem on his 2008 Highlander . . . identical engine to yours. Actually, at the time it happened, I was able to fix it myself, by installing a section of Gates oil cooler hose, which I happened to have in the trunk of my car. It cost us nothing, except some time and a few quarts of oil
After it happened, I also did some research, as you did, and found it’s a common problem on the 2GR-FE engine. And I found out about the factory fix. In fact, I even paid a few bucks to log onto the Toyota technical website, which has the same information the dealer mechanics use. It also gave me access to Lexus and Scion, BTW
What Toyota Motor Corporation will do is replace that leaking hose with an “improved” hose
Trust me . . . I’ve read the paperwork numerous times
They will NOT install that updated metal line
After a few years, that Gates hose I installed started seeping out from under the clamps. And Gates makes good hoses and belts. That tells me the only permanent solution is to install the all metal line w/o any section of rubber hose, and thus eliminate the weak spot
I paid for the line for my brother’s car out of my own pocket. I determined that, for the most part, model year 2009 and newer Toyotas . . . and Lexus and Scion, I suppose . . . with that engine, have the all-metal line installed from the factory. The fact that they had them installed from the beginning means they knew about the problem. In fact, while I was on the website, I even found some documents which pretty much prove that the factory KNEW about the problem BEFORE my brother’s car was even produced. That engine first appeared in the 2004 or 2005 model year . . . Avalon, perhaps. AFAIK . . . the first 4 or 5 model years of that engine all had that lousy design with the hose in the middle. In my brother’s case, a pinhole developed, without warning, from one day to the next, leading to an instantaneous and potentially catastrophic oil loss.
Yet Toyota feels it’s cheaper to throw a bandaid at the problem versus doing what they know to be a permanent fix . . . aka installing the all-metal line
In my brother’s case, he was driving on surface roads, on the way to a relative’s house. He called me on the phone while he was driving and asked me if I’d spilled some oil the day before, when I changed his oil and filter. I said I might have spilled a drop or so, but I wiped it off. He then told me the oil pressure light just turned on. I told him to shut off the engine immediately. He did and I headed to where he was, and installed that hose. That was a few years ago, and I can confidently say it’s suffered no damage, because he put on a LOT of miles since then.
Here’s what I did . . . I walked into the parts department and said I need that line and seals for a 2009 model year HIghlander with the 2GR-FE engine. They gave me the all-metal line. Just for kicks and giggles, I asked them to show me the part for a 2008 Highlander with the same engine, and it was that same BS metal line with the rubber hose in the middle 
BTW . . . I mentioned the oil change, because I can say with 100% certainty that line was not leaking at all the day I did the oil change. It appeared absolutely perfect. Yet the next day it let go catastrophically
Perhaps you can wring Lexus’s necks and somehow insist they do a proper fix and install the all-metal line. Tell them you don’t want a bandaid fix. Tell them you want them to install the good stuff, so to speak.
Unless I hear otherwise, I’m going to assume the “campaign” to fix that line is still open. Meaning it hasn’t been completed. If that is the case, Toyota will pay for damages related to that line failing
