Changed my manual transmission oil the other day. The old oil was 19 years old and had 150k on it. When it came out, you could literally tell which part was oil and which part was water. A few of the mechanics I consulted with said it's likely due to condensation cause of how hot these engines get. I was in a rush so didn't take any pictures but I've attached a picture that i found on google that looks almost like mine.
After searching through the forums, I've decided to use OEM
G052171A2 which my local parts dealer had a hard time sourcing. He said he called up almost all his suppliers until he was able to source me 3 bottles as this part number has been discontinued since 2020 and the new stuff is twice as expensive. 3 bottles of this and a bottle of Febi that I used to run the box at idle for a minute to flush it, set me back about 125 euros. The gearbox took about 2.6 liters of oil to fill up.
Result? slightly smoother gear changes when hot, virtually no sticking or hanging when cold. Before the oil change when the engine was cold and the car was rolling, sometimes I couldn't even put it in 2nd and it would always stick when coming out of 2nd. That all went away now.
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