Quote:
Originally Posted by Unforgiven
Now please also remember, while the car is holding 5 quarts of oil, the Detroit in my tractor-trailer holds 12.5 gallons of oil... big difference and with the larger filters, its easier to go a bit longer between oil changes...lol.
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Unforgiven is spot on if you are going to have short interval drains on the engine you are using, because the oil doesn't have time to get enough particulates to fill it to capacity. However, manufactures like VW are going to LONG drain interval (more common in diesel, as Unforgiven also mentioned) as the recommended oil change (15 or 20K, if I'm not mistaken). So people that wish to follow the manufacturer's recommended interval, will need to find filters that are long drain interval, that's all I'm driving at.
BTW the majority of the particulates (dirt) that you find in the oil are attributed to your air filter not catching them. If you can, get a filter with a larger surface area, this will reduce face velocity of the intake air and the particles will be trapped easier by the filter. If you acquire a filter that is larger than your vehicle takes, see if it will fit under the hood with some modifications. A bigger filter really is better.
Feel free to wing questions my way, I'll try to answer them as I can, I'll be in the lab all day today.