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Great for Ford to change viscosity for the better on that engine. Car engineering takes into account many things and should not throw a viscosity in an engine that can not handle its target load. But that brings up the point that every engine has an optimum. Ford used to have a share of Mazda...

A man’s gotta know his limitations.

If bearings do not operate in hydrodynamic range but operates in mixed range with contact you will know it in short order. That is why wear on the scale you are saying is not relevant. One thing is wear will happen, but what kind of wear?

Thanks, I will file that in my wisdom files.

The problem with rod bearings happen when the rod is stretched. I hate to circle this but since I am a dummy personally I have to rely on this link again. (sorry mods) https://www.substech.com/dokuwiki/doku.php?id=eccentrix_optimal_eccentricity_for_high_performance_bearings Again the...

Here is an example of old science to new science. On this link in figure #8 there are two bearings set to zero eccentricity and .0004 eccentricity. Notice the .0004 eccentricity that the MOFT is tighter than the zero eccentricity. The MOFT is at maximum with that clearance, bearings are stable...

Notice that this is just up to 1 US quart for topping off the engine… As Zee also noted. But the oil recommended is the ACEA 0w20 C5 oil.

Some car manufacturers are quick to change engineering defects some are not. Stay away from first year. https://www.motorreviewer.com/

I would look into these… https://www.harborfreight.com/3-ton-jack-stands-with-circular-pads-58789.html

Toyota GR 0w-20 is different than TGMO. it is a ACEA C5 rated oil. The two engines put in the Supra are BMW. https://parts.elmhursttoyota.com/p-genuine-toyota-gr-supra-mkv-3-0l-oil-change-kit-oil-filter-grsupraoilkit

Engineering better engines and lubrication will always get more efficient. I am curious about the future advancements coming around the corner.

However the advancement of car engineering go hand in hand with the advancement of lubricant engineering. Science is not stagment but always progressing. Do not stick around “old” science too long cause the “new” science is here and changing now.

From what I understand the geometric distortions in a lemon shape of the bearing makes the bearing appear larger size and distributes the load on more bearing surface. That’s a good thing. Read the full link...

Were you referring to this Zee… The conclusions to the post.

My guess is there is an improvement in VII now. (The two types mentioned at 1987) Said “in general VII that sheared performed better”

1987 is a long time ago as you say… over 36 years ago.

Just shoot it in my veins. Double espresso with a splash of irish crème.

Iron is normal from the piston rings seating in to the cylinders. That copper can come from oil cooler but still think you should document the issue with Mazda service of your concerns.

Seems moderator discussing this said there were PM’s involved sent and received. That should answer the OP question.

Saw one person claiming “windowed block” and possible death. Another one sticking 0w-5 in his plane.