meborder
Thread starter
Originally Posted by MolaKule
Originally Posted by meborder
Originally Posted by MolaKule
The 5/15/18 viscosity number cannot be accurate since the XL 5W30 cannot have that viscosity at that temperature.
Someone used a 40 grade before that analysis or that analysis is not to be believed.
The comments from the lab were to suspect coolant intrusion into the oil. When I called them they said that the high viscosity and high tbn were common signs of coolant in the oil.
They said they ran the TBN twice to verify.
I think it is more likely that the samples got switched. If you look at the numbers side by side, it doesn't look like XL 5w30. It looks more like syntec 5w40 to me. But I don't think that is my sample.
If the analyses say no coolant and very little moisture how can that be? Coolant intrusion turns it thin and milky/cloudy.
The explanation i got was that very small coolant leaks where the oil gets hot enough to drive off the moisture, depending on the type/brand of coolant, leaves the oil very alkaline resulting in a high TBN and raises the viscosity.
I'm not saying I agree, I'm only saying that is the explanation I got when I called and talked to the tech.
More likely, is that my sample got switched with someone else.
I can show you another sample of Amsoil XL (old formula) with only about 800 miles on the sample that has more wear metals than the one above supposedly has at 10,000 miles. I've only got 2 samples with wear numbers that low and I think both of them were samples that were accidentally switched.
I'm going to delete that sample from my records because, as you said, it is not to be believed. I left it in just because it showed a potential problem that was resolved by the next sample. Other than that I think it is meaningless.
Given the overall trend, and what we have before us, what does Molakule think? Any overall thoughts in general?
Originally Posted by meborder
Originally Posted by MolaKule
The 5/15/18 viscosity number cannot be accurate since the XL 5W30 cannot have that viscosity at that temperature.
Someone used a 40 grade before that analysis or that analysis is not to be believed.
The comments from the lab were to suspect coolant intrusion into the oil. When I called them they said that the high viscosity and high tbn were common signs of coolant in the oil.
They said they ran the TBN twice to verify.
I think it is more likely that the samples got switched. If you look at the numbers side by side, it doesn't look like XL 5w30. It looks more like syntec 5w40 to me. But I don't think that is my sample.
If the analyses say no coolant and very little moisture how can that be? Coolant intrusion turns it thin and milky/cloudy.
The explanation i got was that very small coolant leaks where the oil gets hot enough to drive off the moisture, depending on the type/brand of coolant, leaves the oil very alkaline resulting in a high TBN and raises the viscosity.
I'm not saying I agree, I'm only saying that is the explanation I got when I called and talked to the tech.
More likely, is that my sample got switched with someone else.
I can show you another sample of Amsoil XL (old formula) with only about 800 miles on the sample that has more wear metals than the one above supposedly has at 10,000 miles. I've only got 2 samples with wear numbers that low and I think both of them were samples that were accidentally switched.
I'm going to delete that sample from my records because, as you said, it is not to be believed. I left it in just because it showed a potential problem that was resolved by the next sample. Other than that I think it is meaningless.
Given the overall trend, and what we have before us, what does Molakule think? Any overall thoughts in general?