Originally Posted by LE_Oil_Guy
I recommend changing your oil filter between extended drains. As engine oil and the filter accumulate miles, they become contaminated with carbon, water and various acids, all of which are a byproduct of internal combustion that will form a film of black, gooey sludge on the interior parts of the engine.
Cold-engine operation accelerates the formation of contaminates because the oil temperatures aren't sufficient to evaporate accumulated moisture. Oil contaminates are also aggravated by short-trip, cold-weather driving. Over time, the filter will collect enough contaminates to become restricted. Most oil filters are changed at an interval of 5,000 to 7,500 miles so if you are extending drains out to 10k or 15k, you need to change your oil filter at the half-way point.
Well, well, well nothing like getting schooled by a newbie. Seriously, all the above is common knowledge to bitogers. Elementary my dear sir. Cheers.