Originally Posted By: 2015_PSD
Originally Posted By: bigj_16
Originally Posted By: 2015_PSD
Originally Posted By: bigj_16
Even if it is 5W-20, over at PQIA, the visco of the virgin is 8.54, which means it is shearing/diluting pretty fast. This upcoming M1 EP sample is going to be the one I am really interested in. Unfortunately, it is 2800 miles of highway roadtrip (80-85 mph), mostly, rather than the combination of city/highway in these UOA's. Still, it should give an indicator of shear/dilution.
You may want to try another lab if you suspect fuel dilution. Unless something has changed at Blackstone, they cannot accurately measure fuel levels.
Not discounting what you say(thanks!). However, it really doesn't matter if it is dilution or shearing. Either is typical of these engines, and in the end is essentially the same thing. A lowering of viscosity. You could make a point about gasoline being a poor lubricant
True, but I would want to know what is causing it. DI engines are known for dilution, but there could be something causing it to be higher than it should. There is nothing you can do to "fix" dilution other than shortening the OCI. You can try to compensate for shearing by increasing the viscosity, hence the reason I would want to know what the root cause of the lower viscosity was and make an informed decision from there.
If this were a single vehicle, with an engine of no history of this, yes. This is two virtually identical vehicles, that have an engine (2.7), a TGDI with a reputation. That is what is cool. I can track two engines simultaneously.
And I am going to "fix" the dilution with shortened OCI's. I am doing these UOA's, to see how short I am comfortable with.