Great Minds Think Alike....
Discovered how well Phil Tenacious Oil works on freewheels about 10 years back. My riding buddy used to comment how quiet my bikes were!
I suspect that it's 120 weight gear oil used in truck transmissions and differentials.
Hint, if you get too much in the freewheel it will drip out when the bike sits in one place for a while and could stain the floor or carpeting. Also makes a mess on the wheel.
When I remove a freewheel, after cleaning it, when I apply the Phil oil, I put a small amount in both sides and rotate the FW to distribute the lube. After that I lay the FW on a paper towel to let any excess Phil oil drain out. After a few hours I flip it over.
Hint, before using a solvent to clean the crud off of a FW, I carefully remove any built up grit around the splits between the rotating and stationary parts so that it doesn't get flushed into the bearings. When I use a water based cleaner, after I get most of the water out of the mechanism, I spray in WD40. It displaces water - WD stands for "Water Displacing".
These Park GSC-1 Gear Cleaning Brushes work great to remove the grit and crud from between the sprockets.
I can hear a lot CFRP bikes coming up on me from the rear. They sound like a cactus rain stick!
I guess that steel is far more "dead" and absorbs the noises better???
verktyg