Yes, I discovered Triflow about a year ago and I do use it. It is an excellent lubricant and works well on all of my machines (401, 301, 27 treadle, 128k handcrank). In the case of my 401, the old oil had varnished and hardened long before my discovery of Triflow. And though I am very confident in my ability to put her back together again, I am very hesitant about dismantling her and soaking her in varsol/kerosene to dissolve 50+ years of old oil. If this had been a Craigslist or eBay machine, I wouldn't think twice about doing that. But as my 401 was my Nana's machine, and she sews perfectly, I won't consider it unless the machine becomes unusable. Other than cleaning, oiling,etc...the only real maintenance I've had to do was to replace wiring and replace the brushes in the motor. I have no doubt she'll keep on sewing for another 50+ years.