My first post looking for some help with contaminated Dot4 clutch fluid (the recommended GM part number).
My 2017 Corvette uses Dot4 for the clutch fluid. Around 6 months (7000miles) after I bought the car new/3miles I pulled the clutch reservoir and was shocked to see the rubber bladder covered in "snot" (pic attached). I cleaned up the cap and sucked the fluid out of the reservoir, dried it out with a lint free cloth, refilled....pumped the clutch like 50 times and repeated this process like 4 times. I also bought a new cap thinking it may not have been making a good seal. I did not go to the dealer at that point in time or bleed the clutch as it is a MAJOR undertaking to get to the bleed screw. I did inspect it several times after that and it had a "miso soup" look to it (pic attached). That yucky looking stuff will settle to the bottom if I don't drive the car for a day or two.
Move forward to 18K miles and my clutch pilot bearing goes out taking out the driveshaft assembly. About $10K later (on GM's dime) I get the car back and they claimed they bled the clutch since the slave was disconnected in the process. I asked them to replace the slave while they were in there but nope.....think they are regretting it now since it is 6hrs labor just to get the slave out! I get home and boom, more "miso soup".
So, I go back and GM wants to "vacuum flush" the system. Get car back and less than 6hrs later when leaving work, boom, more "miso soup".
My Amazon Dot4 tester shows that the fluid is fine initially but its over 4% when the "miso soup" shows up.
GM probably doesn't want to eat this and spend 12 hours going back in and replacing the slave not to mention the huge risk that they screw something up while ripping my car apart. At this point they claiming "we've never seen this" and trying to point me to servivce bulletins about fluid getting dark and that is normal. They have built 30 to 40K cars of this model since 2014 and they say "we've never seen this". Not to mention its a freaking clutch, not rocket science.
I have done a lot of Google'ing but have literally found NO pictures of the "miso soup" situation. Obviously the system was severely compromised when I noticed "snot" on the cap. For the life of me I can't imagine how it could get contaminated this quickly after a flush or bleed. The system is NOT loosing fluid so if its moisture it must be sneaking past a seal at a very high rate.
Now that I've bombed everyone with info has anyone seen the "miso soup"? Moisture or some other contaminant?
Any experienced thoughts or feedback is greatly appreciated.