Very surprised that I didn't find another thread on this: What is the proper gearbox oil for an original XK-120 gearbox? *IF* I understand correctly, modern gear oils have additives which can damage some of the "yellow metal" (yes?) parts inside the gearbox??

Thanks very much.

Submitted by bogot001@yahoo.com on Mon, 06/30/2014 - 10:06

My XK manual says 30W non detergent. I have tried all types and quality.
Detergent oils foam. Cause more leakage. I suggest staying with stock non detergent.
Cheers,
Geoffrey
Don't over fill!