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All the info about having to use 0w-16 because of blah blah, is all moot. These engines are designed for up to 15W-40.
HPL 0w-20 Premium PCMO, 10k mi; 2023 Toyota Highlander 2.5L Hybrid
- Thread starter dkryan
- Start date
This is true.
STILL breaking-in after driving 22,000 miles?!?! Are you kidding me? Do you realize how many engine revolutions have occurred during this time? There are no parts in this engine still wearing in. There’s a layer of oil between ALL contact points and NOTHING should be touching. 
Every time I log into this forum, I’m disappointed by the amount of false information being thrown around.
Engine break-in happens within the first 30 mins of run time after assembly.
Engine break-in is basically done by the time you finish the test drive and drive it home.
What you’re seeing here, lingering for the last 20,000 miles is simply the leftover assembly & break-in particles still trying to be drained and flushed out, even after 3 oil changes.
Had the OP done a FF dump at 100 miles and then do 3x fill & spill to flush the block of break-in particles we would instantly see single digit wear rates at the first scheduled oil change because a brand new engine isn’t shedding at metal!!!
Good troll post, I almost fell for it.
Every time I log into this forum, I’m disappointed by the amount of false information being thrown around.
Engine break-in happens within the first 30 mins of run time after assembly.
Engine break-in is basically done by the time you finish the test drive and drive it home.
What you’re seeing here, lingering for the last 20,000 miles is simply the leftover assembly & break-in particles still trying to be drained and flushed out, even after 3 oil changes.
Had the OP done a FF dump at 100 miles and then do 3x fill & spill to flush the block of break-in particles we would instantly see single digit wear rates at the first scheduled oil change because a brand new engine isn’t shedding at metal!!!
It's well noted that in uoa's conducted from new usually show metals decreasing to their normal wear rate around the 25-35k miles where they'll flatline and become consistent. Some can break in a bit earlier and some can take longer like some diesel engines before finally flatlining and no longer decreasing.
Again, initial wear in particles STILL WASHING OUT.
There’s no surfaces touching together and still rubbing out manufacturing imperfections after MILLIONS UPON MILLIONS of engine revolutions.
A can see a worn out and completely destroyed engine that was taken apart IN THE DIRT, in the slumps of Africa and was hand sanded with tree branches and rinsed with piss gathered from drunks at the local bar (alcohol infused) and reassembled without any torque specs “possibly” still rubbing out imperfect sanding marks and groves for a few thousand miles before BLOWING UP AGAIN shortly after… but not a modern engine with PERFECT tolerances.
Come on now. Who are you kidding here?
Have you personally taken apart any engine? Heck, have you seen videos of used engines being taken apart that show FLAWLESS bearings and cylinder bore crosshatches still present after 200,000 miles??? Where is this break-in wear that you speak of???
which parts are rubbing together exactly??? 
I agree with JavierH19 on this one.
My initial experiences were similar on a M20A-FKS engine (2.0L, same series.)
My initial experiences were similar on a M20A-FKS engine (2.0L, same series.)
There’s a rumor that 2021 era Mobil formulations were also unusually hydroscopic.
Highly doubtful these days with machining practices and finer finishing techniques, plus all of the developments to improve fuel economy from the factory.
What components would still be breaking in at 20+k miles (well over 600 running hours by most driving habits)? This is more likely still wash-out of the initial oil change, since by OEM change schedule there would still be about 5% of the factory fill at 22k.
Claimed it was front extreme short tripping in cold weather. Change the oil and drive further is really the only way to fix it. Never heard about the Mobil thing mentioned above. That would be super crazy if it is true.
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