Originally Posted By: Toptierpao
You are telling us that 1.5% fuel dilution will NOT sheer oil??? Ok,I respectfully disagree. Agree with you on the measurement accuracy.I have spoken to an extremely bright man with a physics degree in the oil industry who told me that those numbers can be off by 25-30% on either side.
BTW it is "shear". Sheers are a type of curtain.
And yes, I am saying that. Shear is a mechanical term and means cutting. Someone a while back posted a paper that showed some degradation of VII from fuel but IIRC it wasn't mechanical cutting like an oil that has been subjected to mechanical shearing. It was more like an inhibiting of the VII molecules to extend when hot. If this is indeed fuel dilution then it is like diluting maple syrup with water. The molecular structure of the syrup hasn't changed but the viscosity of the mixture dropped due to the addition of a lower viscosity component.
The gear driven camshafts on my old Sienna will shear the oil but I don't have fuel dilution. It is an important distinction since you may be able to do something about one of them but not the other. Or, you may not be able to do anything about either one. But knowing what is causing the viscosity degradation would be key.
You are telling us that 1.5% fuel dilution will NOT sheer oil??? Ok,I respectfully disagree. Agree with you on the measurement accuracy.I have spoken to an extremely bright man with a physics degree in the oil industry who told me that those numbers can be off by 25-30% on either side.
BTW it is "shear". Sheers are a type of curtain.
And yes, I am saying that. Shear is a mechanical term and means cutting. Someone a while back posted a paper that showed some degradation of VII from fuel but IIRC it wasn't mechanical cutting like an oil that has been subjected to mechanical shearing. It was more like an inhibiting of the VII molecules to extend when hot. If this is indeed fuel dilution then it is like diluting maple syrup with water. The molecular structure of the syrup hasn't changed but the viscosity of the mixture dropped due to the addition of a lower viscosity component.
The gear driven camshafts on my old Sienna will shear the oil but I don't have fuel dilution. It is an important distinction since you may be able to do something about one of them but not the other. Or, you may not be able to do anything about either one. But knowing what is causing the viscosity degradation would be key.