QUOTE(kirakun @ Feb 17 2017, 01:33 PM)
I do agree on the oil doing it's part as a part time cleaner for the engine however
i'll say the color of the oil will be a more appropriate marker as the gauge, don't u think so? With that being said, isn't the oil filter supposed to filter the contaminants down to 5 or 10 microns(human hair is 45-70 micron)?
Since the oil filter is present and doing the filtration, how can the visually visible contaminants still present in oil dip? A clear indicator that the engine is mighty dirty or just the oil filter/oil is way due for replacement or both.
Don't get me wrong i also do agree that UOA is the proper mean to gauge the properties of the oil though.
In the end all guesswork.
And if you say its supposed to filter that low micron, your eyes also can't see them how do you determine the darker color is contaminant and is not deteriorated oil?
And even even I mention deteriorated oil, how deteriorated do you know it is? You cant gauge viscosity properly nor can you check flash point or insolubles.
My oil samples are way darker than that due to rough /high stress /track usage and yet UOA turn out fine.
Logic here: if your oil filter is so good, you also don't need to oil change and supposedly all your drained oil would look damn nice right? (assuming you use good oil)
And again, all I posted here, would all be estimates /guesswork without a proper UOA