I have a Shimano freewheel (MX-30) that came with my bike from new. Unfortunately the internals got all gunked up and it stopped working (never engaged and became free both ways). I have bought and fitted a replacement part, but I would like to know how I should lubricate / maintain the freewheel so that this does not happen again.
I love ATF (Automatic Transmission Fluid) for freewheel (not free hub) lube. What I do is lift the bike-- if someone can help you with this, it's a bit easier-- so that you can rotate the pedals (and make the back wheel spin). Ideally, the bike should be tilted to the non-drive side about 45-60 degrees. With the back wheel rotating, you can see where to lubricate. As Sheldon puts it:
BTW, thought I should add what I keep my ATF in for cycling purposes. I have some old plastic bottles that once held printer ink. They look similar to this: