Zehntes Jahr der Veteran
- Oct 13, 1998
- Boise, Idaho
- 2013 Passat TDI, Newmar Ventana 8.3L ISC 3945, 2016 E250 BT, 2000 Jetta TDI
Not true. The soot due to dispersents remains at the 50-500 nanometer size, Particles as large as 7-15 microns will freely pass thru a full flow oil filter. In other words NOTHING in your engines oil can be filtered out short of using a 2 micron by-pass and even then very little is actually filtered out in the 2 micron element which is why the elements can last up to 60,000 miles between changes.olson325is said:The oil filter becomes plugged with carbon the builds up after time and that time is based on your driving style.
If you were getting solids in your oil filter (you will never find any, go ahead and prove me wrong) then the oil is either not rated for a diesel (lacks proper dispersents and detergents) or the soot loading is so excessive that you have an engine in dire need of a tune up, in which case you probably noticed the coal fire coming out the tail pipe...and probably have a few polution citations to go with it.
Even wear metals (assuming they categorized as normal) are less than 1 micron.
The bottom line is that an oil filter is simply a last resort at stopping something that can cause damage to the engine, otherwise they don't stop or remove any normally occuring contaminant in ANY engine.
Again not completely true. VW's and most other German cars regulate oil temperatures by way of an oil to coolant heat exchanger. This heat exchanger HEATS the oil and burns off any residual moisture in the oil. As long as the oil is heated above ambient temperatures (possible on even the coldest of days) the moisture will evaporate from the engine and be burned off by way of the CCV system.If you do a lot of short trips you should change oil more often because of the condensation build up in the engine.
The issue with moisture is not the moisture itself but the reaction with combustion by-products that forms acids in the oil. Oils especially the long drain oils have higher levels of "base" or acid neutralizing chemicals that prevent the formation of acids and other corrosion forming compounds. As long as those base chemicals (identified using a TBN test) are still present, the engine is protected from damage due to acid formation. Generally even with short trips in winter weather TBN will still remain at sufficient levels that after 15K you have ample reserve to safely run out to 20K. The biggest reducer of TBN is sulfur, since this is virtually eliminated from diesel fuels, the acid formation is nearly eliminated as a possible issue thus further increasing your drain intervals beyond what was typically recognized as possible.