Hey steemit mining community!
I wanted to dedicate a video to the old question why sometimes oily substances can be found on your GPU.
tl;dr (or tl;dw)
Reason 1 (most common): Thermalpads leaking silicone - no problem since dielectric, but should not get into your riser (might result in frozen rig or unrecognized card) just clean with 99% alcohol or WD40's contact cleaner (not the ordinary WD40)
Reason 2: Fans also have a tiny drop of oil in them, even that can leak, but unusual, fans should be checked if they still run smoothly though.
Reason 3 (of the past): Flux from soldering, more uncommon now because rinse-free solder paste is quite popular nowadays, but one never knows.
Reason 4 (worst option): cracked heatpipe. RMA if still possible because the card probably won't stop overheating.
Greetings and oil free mining to all of you!