Years back I heard about Tufoil and decided to start using it. I work in a Laboratory and we had an instrument called a Timken Tester. The Idea is to add two litres of oil and spray it on a bearing for 10 minutes under a heavy load. ~ 35000 lbs/sqinch. Then you check out the metal block for wear. If I had some room left for pics I would show them. I feel that this stuff contributed to the longevity of the 3B. Still going strong. Its to bad that they stoped selling it at Can Tire. I just ordered 2 Gal online. If any one else has experiance with addatives I would like to hear it or some opposing views.