Black Oil Immediately After Oil Change - Page 4 - Ford Powerstroke Diesel Forum
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post #31 of 32 Old 12-21-2018, 06:39 AM Rookie
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Your filtering an additional % of oil at the same time as your normal filter is doing its job.
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post #32 of 32 Old 12-21-2018, 07:31 AM
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Originally Posted by MrTommy View Post
Not sure I understand what a "bypass" filter does. What is it that you're bypassing?
The filter system I'm talking about is mounted away from the engine, the vehicle frame is usually where it's mounted. It has an adapter that connects to where the oil filter is installed on the engine, 2 hoses are connected to the adapter (oil in and oil out), those hoses are connected to the remote filter housing, two oil filters are mounted on the remote filter housing, the first filter is a full flow filter (95% of the oil runs through it) and the second filter is a bypass filter because only 5% of the oil goes through it and it is a 2 micron filter.

The system will add an additional 4 Qts of oil capacity to the system, and the filters are changed in a different way than you might be used to, the full flow filter is changed after 10-20,000 miles have been driven and the bypass and full flow filters are changed after another 20-40,000 miles has been driven. So your engine is effectively getting an oil change about every 45 minutes that the engine is running at an RPM equivalent to driving down the road @ 45 mph. You can extend or shorten this interval if you take a sample of the oil and send it off to be analyzed, when you get the report back (usually a few days) it will tell you if the oil is good to continue using or that it needs to be changed. I have this system on my truck and it now holds a full 4 gallons of oil.

One of the biggest known issues with the new power strokes is fuel dilution, so, if you're mainly driving city miles you will need to change the oil more frequently because of the amount of fuel that will be in the oil, so the recommended oil change intervals from Ford should be cut in half in order to protect the internal engine components from excessive wear which could lead to engine failure.

I hope that this clears up the confusion.
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