Reclaiming fuel contaminated oil

[Carlostrece]

I suggest using a low cost oil so that changing it doesn't hurt financially. Then problem solved well enough.

 

[burbguy82]

I don’t know what you’re asking. Mechanical shear of the VM is dependent on several factors.

two samples...same pil

one with fuel dilution

one without

krl test........

which one shears more?

 

[kschachn]

two samples...same pil

one with fuel dilution

one without

krl test........

which one shears more?

It depends on shear forces and specific circumstances. Most engines do not tend to shear the VM.

But also in general the presence of fuel is detrimental to the VII in the oil. Use an oil with no VM and there won’t be any shear regardless of fuel.

 

[burbguy82]

It depends on shear forces and specific circumstances. Most engines do not tend to shear the VM.

But also in general the presence of fuel is detrimental to the VII in the oil. Use an oil with no VM and there won’t be any shear regardless of fuel.

what is VM?

 

[kschachn]

what is VM?

The viscosity modifier, or VII.

 

[oil pan 4]

what is VM?

Magic

 

[burbguy82]

The viscosity modifier, or VII.

So if there is no VM, then fuel has no effect on shear stability?

Do most common off the shelf brands use VMs?

Which do not?

 

[MolaKule]

So if there is no VM, then fuel has no effect on shear stability?

Do most common off the shelf brands use VMs?

Which do not?

The search function shows this:

Post in thread 'High Performance Lubricants No VII series engine oils.'

Nov 28, 2024

It’s still in sump of my dad 11’ Focus with 98k on it. No consumption at all. Better than restore and protect think. Least I know what I’m buying

• 53' Stude

• 

 

[Rmay635703]

So if there is no VM, then fuel has no effect on shear stability?

Do most common off the shelf brands use VMs?

Which do not?

HD30/hd20 and some 10w30 full synthetic oils.

Otherwise no VI is rather rare

 

[burbguy82]

The search function shows this:

Post in thread 'High Performance Lubricants No VII series engine oils.'

Nov 28, 2024

It’s still in sump of my dad 11’ Focus with 98k on it. No consumption at all. Better than restore and protect think. Least I know what I’m buying

• 53' Stude

• 

I am not sure of what this means.

Thanks for the reply. But the link when to someone talking about someones dad car or something.

 

[kschachn]

So if there is no VM, then fuel has no effect on shear stability?

Do most common off the shelf brands use VMs?

Which do not?

No, there is nothing to shear. Oil molecules will not shear in an engine, the shear forces are nowhere near great enough to do this.

As noted, nearly all oils use VII except monogrades and a couple muti-grade oils that could also be labeled as a monograde. But the shear stability is dependent on the quality of the VII as well as the tendency of a specific engine to cause shear.

 

[burbguy82]

No, there is nothing to shear. Oil molecules will not shear in an engine, the shear forces are nowhere near great enough to do this.

As noted, nearly all oils use VII except monogrades and a couple muti-grade oils that could also be labeled as a monograde. But the shear stability is dependent on the quality of the VII as well as the tendency of a specific engine to cause shear.

As normal, I am misunderstanding something. Please help me understand.

If a motor oil starts off at viscX, and ends at viscX-1......that is due to viscosity modifiers "losing a battle"

If in an engine oil does not make oil shear, then what causes the viscosity to change?

Is it the fuel "attacking" the VMs and not the "oil"?????

 

[kschachn]

As normal, I am misunderstanding something. Please help me understand.

If a motor oil starts off at viscX, and ends at viscX-1......that is due to viscosity modifiers "losing a battle"

If in an engine oil does not make oil shear, then what causes the viscosity to change?

Is it the fuel "attacking" the VMs and not the "oil"?????

Fuel dilution is essentially a lower viscosity fluid being mixed with one of a higher viscosity. If there is fuel in the oil then it will lower the viscosity of the oil just by being there regardless of whether it is a monograde oil with no VII or a multi-grade.

VII degradation is a separate issue. Fuel does attack the polymer molecule and can cause both temporary and permanent damage just by itself. Look it up, there are lots of sources on this.

The other way VII is degraded is by mechanical shearing of the VII molecule. This can be exacerbated by the presence of fuel.

https://www.infineuminsight.com/media/1813/2-viscosity-modifiers-na.pdf
https://www.infineuminsight.com/media/2606/emea-viscosity-and-viscosity-modifiers.pdf
https://www.savantlab.com/testing-highlights/viscosity-loss-its-only-temporary/

 

[The motor guy]

Why not just drive aggressively to build oil temperature to 220-240?

Why not stick it in a pot on the stove for 20 minutes for the fuel to evaporate? Right next to the Christmas gravy