Ran this test to check engine condition more than anything, as I bought this Jeep with 120k on the clock. Have run it to 130k and had 5k on this OCI. Post this test, I'm running high mileage M1. Highest 100C cSt I had in my stash, as I've read the 4.0 prefers heavier grades. Though I've found posts on various Jeep forums saying M1 brings out higher iron UOAs in the 4.0. Regardless, that's a future issue. The high silicon I'm chalking up to the oiled Volant air filter the previous owner had put on. I've been good about oiling (with their oil) and cleaning, and it's still decently oiled at the moment. I had read about general complaints that oiled filters don't filter well and it seems to hold true in my case. I wheel offroad in summer dusty CO mtn environs. But no more, I'm replacing it with a cone shaped AEM Dryflow element, in the Volant air box. I do not have the stock box setup to put back in. I'm hoping the elevated iron and aluminum are directly from the poor filtration/high Si. No anti-freeze or water, and trace fuel, looks good. No oil burn in the 5k. Which is incredible, unless I forgot and didn't note some add along the way. Anyone's thoughts are welcome. Thanks.