The only lube I have ever used is regular old gear oil and it sucks balls. I will be trying penzoil synchromesh because we just started stocking it at my store, so its easily attainable for me and relatively cheap. Im not sure what to suggest to you since I dont have much experience with different types of gear oils in DSM trannys. I really just wanted to ask you what clutch you decided to go with, but I didnt want to leave your original question comepletely unanswered. So which clutch are you using? Flywheel? Stock line?