Originally posted by InsaneCivicSedan
but keep in mind, when you change your oil, dirty oil remains in the cooler, unless you completely remove the cooler.....
Yes but also keep in mind that said "dirty oil" mixes with the new oil thereby diluting the concentration. A regular oil change interval will prevent sludge buildup and the use of a synthetic motor oil will go further to prevent this as they tend to be more resistant than conventional motor oil.