What type oil do you put in the shocks for a 1938 LaSalle

[ChrisRoger]

What type of oil do you use for the shocks of a 1938 LaSalle?

[JoeCeretti]

Motorcycle shock oil works great.. or hydraulic oil as long as it has an anti foam agent.

[Fred Pennington 25635]

Jack oil works as well.
If your seals have become hard you can also get jack oil with stop leak.

Do a couple of searches it has been discussed several times.

[Steve Passmore]

I think that 'Stop leak' only works to soften and expand rubber lip seals Fred.  The early shocks have only felt seals. Have you seen that it works on felt?

[Fred Pennington 25635]

Steve, The original seals were / are leather.
I have used jack oil with stop leak on both my 40 LaSalles and it works quite well as long as the shaft is not grooved and the seal is intact.
I found out about  it 3 or 4 years ago on this forum.