I have a 1980 450SL that I plan on using as a (hopefully) daily driver. The car had high idle problems and climate control issues. I've been working on figuring out the vacuum leak issues. I found one under the hood that fixed the idle issue. I'm now working on replacing the vacuum pods in the dash using the advice found on this forum and I have been working on removing the lower heater box.

Anyway, the point of this post is that it appears oil has leaked into the driver side footwell area. My first thought is leaking oil from the oil pressure gauge. (It doesn't look like it's leaking now.) My second thought is that it's a refrigerant leak.

Any ideas?

Thanks in advance!
Russ Jensen
Modesto, California