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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...

From a 2007 Subaru Forester 2.5 naturally aspirated with 162K. I ran the oil to 8050 miles not by choice. I was a bit derelict in getting it changed. I had the external infamous head gasket leak and both HGs were replaced at 125k. This was my first UOA after that work a few years ago. This run...

This is the dino Chevron, purchased in early 2012 roughly. I previously planned to test every 50k. But with the heavy towing on this cycle (~3000 pounds over 1100 miles for the EJ25 4 cyl), I tested earlier. Not ideal to run 6500 miles, was boneheaded. But the oil held up. Sample was taken just...

This is 90% wide open highway miles. Run in the winter of 12/13 till May 2013. Bonus, the previous Mobil Super 5w30 SN is included. TBN on both. Blackstone Labs. I've had some oil leaking from the driver side head gasket. Fearing the typical EJ25 head gasket leakage problem, I was worried about...

I ran Rotella T6 5w-40 before this. Does that explain the titanium? Miles were 90% highway. This was an API SM MC5K. 50-56k on the odo for this run. "Universal averages show typical wear for a Subaru 2.5L engine after about 4500 miles on the oil. Your oil was run for 5700 mile, and wear metals...