After reading the rave reviews here on the oxtar boots I picked up a pair. I used the silicone oil that came in the box but it was useless! squeak squeek... So determined to win I dug out a tube of synthetic grease *with Teflon* and squeezed it under and over the sliders. Quiet as a lamb now except for some leather sounds.
the brand was TRI-FLOW and I bought it some time back at a bicycle shop, "push-bikes shop"