Re: Red oil tint, confused?
I don't think the filters can do anything to the oil. I suspect that you may be checking under fluorescent lights... of some kind. If there was any black-light effect it might show the oil as tinted.
When I check and look at the dipstick, oil looks clean, but when I drain into the pan, it begins to take on a golden brown color. If I waited long enough between changes, I likely could get the oil to a black color.
If you check the level outside in sunlight, what color do you see?
tom
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