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Originally Posted by euromodder
This is ridiculous, really.
The low temperature viscosity isn't the real issue either, it's the high-temp viscosity you need to know and measure.
Many vehicles have magnetic oil drain bolts.
They collect a fair bit of metal parts that you can really feel.
Even small metal parts in oil are abrasive when they get in between the surfaces they need to lube. All this junk accumulates over time.
Metals are also an indication of the wear of the engine.
In a diesel, soot also accumulates in the oil.
That's not good either.
Never may be a very bold claim, but oil is often changed far too frequently.
A friend of mine went 90.000km / 56.000 miles on the original (and very expensive) oil in his diesel Beemer.
Many trucking companies run long oil change intervals, with multiple filters, including a low flow, very fine bypass filter to get the smallest particles out.
A car usually has but 1 filter.
Direct contamination with fuel or water will certainly ruin the oil quickly.
Oil dilution has become an issue with more modern diesels with particle filters, or when you're running biodiesel.
The oil in the engine isn't sealed off from the atmosphere, so some water vapour does get in and out with temperature changes.
Remaining TBN is the factor to look for when you want to run your oil for extended periods. It will go down over time, and ultimately will indicate when it's time to get rid of the oil - if it hasn't accumulated so much crud that it needs replacing before the TBN drops too low.[/
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Think logical, did the science showed proof in front of the public ever testing two similar vehicles one with oil change and the other without? Never! I will change the oil filter every 30.000 km but never the oil. I will just monitor the level and add oil when neccesary. So far for 30.000 km i added 0.3 liters of oil.
The big metal particles worn in the engine will be stopped by the filter, the very small particles are nothing even if they travel around the engine. Even water if it is highly pressurised can be abbrasive for the metal but we are talking about 3-4 bar (50-60 psi) oil pressure and very small not important particles of metal in the engine. All in all as i mentioned before i will monitor the oil. if it losses viscosity and it thickens it means the oil is dead, otherwise if stays thin it is perfect. We will see. Lets verify ourselves if we really need an oil change. The oil companies want to sell as much as they can, this what they want. Do we really need it? this is something else.
If we talk about wear the amount of metal weared from the engine it absolutelly small amount that won't affect the engine at all. The labs are finding some metals in the oil but thats normal, the new oil itself contains some metal elements. The labs are manipulating! This is a very big bussines. Even human blood contains metals! The propaganda for oil change is big thefore people are scared not to drain the oil. I am convinced and i will never change the oil of my car. 33.000 KM (20500 Miles) in my car passed absolutelly no problem with that oil!