My bottle had the black gunk in it when I recently did a coolant change. I’ve had the oil cooler changed. While there was a little bit of an oily tinge to the coolant, it was the more soot like black stuff that caught my eye. I’ve since changed the coolant and bottle and will see what comes of it.
I suspect EGR coolers in my case but I don’t fancy the cost to change them out, and I don’t think you can blank the 3L even with a tune as I recall it needs functioning EGR to test against. I also read the so called emulators weren’t much cop.
2010 TDV6 3.0L Discovery 4 HSE
2007 Audi RS4 (B7)
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