Fe ppm/1K is the wear rate and is (IIRC) a more important number as long as total Fe also stays within a certain range.whitedog said:Is anyone else seeing that the amount of FE in the oil is going up? What would the FE PPM be at 25,000?
I'm trying to understand why FE PPM / 1000 miles is relevant.
Define High iron....whitedog said:What does the wear rate give me a picture of?
If I have high iron, I want it out. Why should I care if it got there in 5000 miles or 20,000 miles?
Total Fe alone isn't a valid metric. Wear rate is the metric.whitedog said:But if your FE PPM is so high that it gets flagged, why would you want to keep it in there?
The point where the lab flags it. It's somewhere below 66 PPM for a broken in TDI engine.Drivbiwire said:Define High iron....
Size is the result of genetics.Drivbiwire said:Size is the result of poorer performing oil. Poorer is identified by higher Fe/1K wear rates.
What do you consider an extended oil change interval? If 10k miles is normal, then is 15k an extended OCI? 20k?DeliveryValve said:For those that are using an extended OCI, when do you consider changing out the oil filter? I am not sure how far an oil filter can go without clogging?
I believe this is misinterpreted data. Yes, wear rates (as determined via UOA's and normalized in ppm/l and 1000Km show these numbers, BUT:Drivbiwire said:STOP STOP STOP!
VW does NOT want oil change intervals of less than 10,000 miles due to how the oils function in the engine, shorter intervals INCREASE WEAR.
Don't argue with me about it, if you take the time to track wear rates during an oil change at 250 mile intervals you can plot the reduction and stabilization of the wear rates out beyond 25,000 miles!
This is where the problem starts; Contaminants (and by this I only reffer to those hard enough to cause scoring) come in sizes:Drivbiwire said:Anybody that tells you that short oil drain intervals are good for your motor don't know what they are talking about!
Has anybody analyzed the contents in a used oil filter to determine exactly what was caught by the filter? Maybe we need to create a Used Oil Filter Analysis (UOFA) database.stefan_b said:Filters are a very important consideration. First of all filters... well filter - thus retain - contaminants. Therefore what the UOA tells us is what is the equilibrium level for contaminants in the oil.
To cap it all off, the more you use the oil, the more it is filtered, the more small particles it will hold (the large/medium ones get filtered).