I reacently smoked my Lehner 1940/7 which I have been running for about a year on MM.
When I changed to MMM the Lehner got a lot hotter and in the last run too hot I guess :(
My Tekno NEU 1515 1y will probably arrive next week so I hope I wont have any issues with that one!
I noticed that my hacker 7xl was running quite warm with the MMM as well. Like feigao temps