The only Finish Line oil worth going for when it comes to sewing machines is the "Ceramic Wet Lube" version. It's in a bottle with a gold cap, at least last time I bought it. It's a light syntetic oil with teflon, very comparable to Triflow. The "Extreme Wet Lube" and the other bottles I've had from this brand is much thicker and stickier, made to coat metal and last in all kinds of salty and wet conditions. The Ceramic version is actually a very good oil for sewing machines (promise!), and the additives are aimed at reducing fricition and wear, not stand up to harsh conditions. Appart from this; my main suggestion was just to try something different than you already had used. I'm sure you are onto it, and it's all about getting the oil into all the nooks and crannies. I know it's not easy when you can't turn the mechanism at all.
Last edited by Mickey2; 01-27-2016 at 07:18 AM.