Can anyone recommend a suitable lubrication for the compression/piston seal, based on long term experience with the pistol?

The manual just says lubricate the compression seal cup via the slot in the compression chamber....the type of lubrication is not detailed

I did a web search and surprisingly folk advised against using pellgunoil with the suggestion that it can gum up the internals. They recommend 'Special Sauce'

I did a search on bbs (IZH 46, MP 46 lubrication) but it came back with so many hits which did not seem to be directly relevant.

Given that replacement seals are very difficult to get hold of, using a compatible lubricant could be very important.

Thank you in advance.