Motul 0W8 Has Same Viscosity as a 40 Grade Oil

[4WD]

How 0W8 works - until it doesn’t

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[ZeeOSix]

... Hydrodynamics and the resulting film thickness between moving parts will always be a function of the fluid viscosity. Tribology 101.

 

[Rand]

There are so many issues with the OP's thread starting post I have no idea where to start. but happily many have already pointed out the issues.

 

[supton]

Since the good Dr. can clearly afford to replace the engine if it decides to play rod peek-a-boo, I say go for it, let's see what happens.

Indeed! but can it be sent to that “I Do Cars” guy on youtube for the teardown?

 

[billt460]

While there is no doubt that Motul is a good brand of oil, I doubt their 0W-8 is going to do anything magical that anyone else's 0W-8 can't do. And I highly doubt it's viscosity is "the same" as a 10W-40 at temperature. That makes no sense at all.

 

[Graham Piccinini]

Your cars are begging for this juice, @AEHaas. You know it... Let 'em have it... And let us see the carnage.

 

[gregk24]

Yeah, no way that any 0W-8 has the same HTHS as any xW-40 on Earth. Seems like BITOG tribology is going into the junk science realm.

There sure has been a log of junk science going on lately...

 

[Renzo]

Subscribed

 

[Accent Abuser]

Just pour Ronsonol in it already, you know you want to.

 

[Accent Abuser]

If that's the case, then 0W-8 shouldn't be "chosen" for anything, except for use in Antarctica.

That's what the 0w40 is for!

 

[billt460]

That's what the 0w40 is for!

Put them both in the freezer, and see which one is more viscous.

 

[Accent Abuser]

At -40°C I'd bet they're both pretty viscous.

 

[OilUzer]

The parts are losing mix/hydrodynamic lubrication. No speed, and the oil film essentially goes to zero.

"No speed" & "piston slows to a stops" ???

Not according to that one thread a while back. You remember?
That discussion would have been a good fit for here!

 

[ZeeOSix]

"No speed" & "piston slows to a stops" ???

Not according to that one thread a while back. You remember?
That discussion would have been a good fit for here!

Yeah, that was a stellar thread, lol. There isn't enough piston speed at TDC or BDC to support any hydrodynamic or mixed lubrication. Also, there is less mixed and hydrodynamic lubrication of moving parts at idle then there is at higher RPM.

 

[Odd_Ball]

"No speed" & "piston slows to a stops" ???

Not according to that one thread a while back. You remember?
That discussion would have been a good fit for here!

I must have missed that one. Sounds like a doozey.

 

[benjy]

if i remember correctly i believe that performance oils RACING oil 0W8in a pro stocker over a thousand hp was about 12 centistokes during the short 1/4 mile run due to lower oil temps!!