While we are on the subject, something you may or may not know. Looking at a filter substitution guide, which I have done several times so as to reduce the types of filters necessary to service my equipment, I obviously look for the smallest micron filtration number.
What you have to remember is that "full flow" rated filters have a limit as to how small a particle they will allow to pass, usually 20 microns, give or take to allow the volume of oil to pass that the engine requires.
On OTR diesels, you will find 2 filters, a full flow and a partial flow. The partial flow only gets about 10% of the oil volume (due to internal restrictions) but it's of a much tighter media limiting flow-through to around 5 microns and is in there to clean up the leftovers......one of the reasons why you get a million miles between major overhauls.
Course you could do it all with one filter but to get the full flow, it would be huge.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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