Originally Posted by Maxwell

Oil doesn't break down, it loses additives and becomes contaminated, change the filter and add 1 quart. Otherwise if the oem filter isn't able to filter to 1/10 micron get a by-pass filter they also remove water from the oil... If you ever had the pleasure to cut open a screw on OEM filter from Toyota you will see they are not cheap as* pleated paper filters, but they are dense depth style by-pass filters, and now you know the secret of why Toyota engines last so long as compared to other manufactures. They are running by-pass filters.