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      01-10-2013, 02:45 PM   #29
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Drives: 2015 435i
Join Date: May 2005
Location: Southeastern US

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Originally Posted by Julesandtrish View Post
Thanks for the info Former Rotor. So just to make sure I have this straight, normally us diesel fuel doesn't have water. However, the demulsifier in the opti lube may make water present which would then in turn not be a good thing. I do not have a separate apparatus to filter any water like TDIWISE does, so I just want to make sure that I understand fully what may happen with my opti lube usage.
I also read somewhere that our fuel filters have some sort of built in water separator in them with an unknown capacity. I will try and find the link, but is there any truth to this and would it matter? I'm guessing not or you would be using XPD.
There is a min amount. It's measured in combination with sediment and is .05% (ATSM D2709).