MKVI Golf R Haldex fluid screw up

[sicgolfrowner]

I accidentally added gear oil to my haldex portion of my rear diff today. I'm letting it drain overnight and filling it with haldex fluid tomorrow but my question is do I need to remove the haldex controller to get the remaining gear oil out or can I just open the drain hole and let it flow out?

[Apexxx]

idk about the controller, but a good and easy way to clear the Haldex is to run a fill of ATF thru it, then drain. Best fluid would be Dexron VI, or just a good Dex III. Skip the friction-modified ATFs, like ATF+4, Universals, HiMiles, etc. Dex is nice and grippy for the clutchpacks, to compensate for the slick Gear Oil (GL-5) that's in there.

fwiw, if you were just flushing an overdue Haldex or for some reason needed a replacement fluid in an emergency, a "Universal" or "Multi" ATF has special friction additives which react "properly" to the clutch material they are exposed to.

Whatever you do, imo that GL-5 has to get out, and ATF is the most cost-effective way to do it.

[Apexxx]

Let me be more clear, you don't just want to drain the gear oil out of the case, you want to physically scrub the GL-5 friction modifiers OUT of your clutchpacks. The only way to do this is a flush. Good luck buddy.

[sicgolfrowner]

Let me be more clear, you don't just want to drain the gear oil out of the case, you want to physically scrub the GL-5 friction modifiers OUT of your clutchpacks. The only way to do this is a flush. Good luck buddy.

Can I fill it back up with haldex and once it has soaked in can I flush it and refill it with the haldex again?

[Apexxx]

Sure, if you want to spend a few bucks more and use Haldex fluid twice. I would drive it a good 10mi to warm up and then dump it. I just don't think you should drive more than 100 miles or so on the mixed GL-5 & Haldex fluid.

You'd def be ok flushing it w/Dexron, using Haldex and then waiting till a reasonable service interval to change it again, say 20-25k.

Admittedly, this is mostly opinion, but based on a solid knowledge base.

[Apexxx]

Do you have a specific concern or question?