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No. The bearing is supported by the oil wedge. That way of looking at it only works if there is no high pressure gradient of oil film (no circulation) and relying on viscosity alone. You're thinking about it like squeezing something out from between two surfaces. That's not what's going on...

Very good question. I got hung up on that, too. Yes that's correct. More pressure with the higher viscosity oil. That axis is squeeze film pressure. It's resistance to flow as oil redistributes along the surfaces. It's not bearing support pressure. Consider pressure and flow. Flow in a...

Thinner oils than the bearing design can support result in more wear* I'm not trolling, so I'm going to stop so they don't lock the thread. You're making it personal for no reason. I'll work with data, though. I'll discuss. I'm not doing what you're wanting to do.

You can't say whether it's an issue or not. You have no idea because you hadn't heard about dynamic loading until a few hours ago. You actually thought dynamic loading meant changing rpms, ok? Give it some time and study. Nissan says that because thicker oils at higher temps behave like the...

You never said that. It's something you'd say. Kind of how you're like "all the engines running thicker weights..." Going up a grade? Potential benefits. Depends on many factors. Not going up two grades for no reasons other than more MOFT = more better. Like those people saying ignore...

Whatever dude. You can't even show why it's wrong. You just keep saying nuh-uh. I used your own graphs to demonstrate what you laughed about - engines are designed with a viscosity in mind. I answered the big question many people have, including me. Is too thick bad? Yes. It potentially...

Yes. In all cases more viscosity provides higher MOFT. Ok? Ok. The fact is that it's possible to optimize for MOFT with bearing clearance. Clearly it's possible. At some point enough MOFT is enough. It's enough MOFT by design. Evidence along your line of thinking is that all the cars...

MOFT decreases with clearance. Effect of MOFT with decreasing clearance isn't as pronounced with lower viscosity. Trends may reverse. Bearing clearances can be optimized to maintain suitable MOFT. Bearing clearances can be optimized for a viscosity.

Clearly in that graph MOFT decreases with clearance. In the graph Chris posted the thinner oils don't have as pronounced effect. Well. I tried. I wanted to explain, but you're not receptive to it I see. Carry on.

Please. I'll explain. One thing at a time. Not a bunch of different things conflated. Agreed on that one point?

Where viscosity is the constant, and the variance is rpm. I'll do yours next if you want. I'm stepping through to figure out where our perspectives diverge. Please be patient I'm not trying to be pedantic.

Either works, but I'd prefer to focus on the mid range rpm Zee posted.

This graph consists of various data points for bearing clearance and MOFT while holding viscosity constant. Agree?

Because it didn't affect L87's prior to 2021. Because warranty replacements are spec'd back to 0w-20, and the warranty is extended to 150k/10yr.

That's why I want it here. Had to go searching. The one from post 326.

Please post that king bearing graphic again for context. I'll show you.

I've know forever that viscosity is related to temp. That's why I always roll my eyes when people say if they can use it at the track it'll work on the street. The Nissan recommendation scales with ambient temps. That means higher oil temps. Grades are separated by 20-40F above 212F...

NASA It is MOFT. YES! MOFT must be maintained as load changes. As the load changes the shape of the hydrodynamic wedge changes. Thicker fluids aren't as responsive to changes. That's not hard to figure out! I'm not making a general statement about any viscosity. The narrative is that an...

Now it's cherry picked garbage. "La-la-la I can't hear you." Because at the track the temps are higher. Same for higher ambient temps. Go ahead and plot some viscosities vs temp. x-axis 200F to 350F. Draw a line straight across. There's what temp the oil need to be to have equivalent...

That's not dynamic loading. Force driving the surfaces together is loading. Force changing is dynamic. Everything can't be a cherry pick just because you don't like it. You're being obstinate and ignoring the math. Like you put it to me, you need to study on journal bearings. I posted the...