Mineral oil is used in a 300E with R12, but can someone confirm the actual viscosity that should be used? Apparently the mineral oil comes in a few different forms. Does it make any difference so long as it is mineral oil for R12 systems?

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• 2001 E320

Does Mercedes cite a particular specification in their
service literature? I don't recall seeing one for A/C
oil.

When servicing my '87 124 system last fall, I just used
a dehydrated mineral oil for air conditioning systems,
purchased at my local McAutoParts store. It's only been
seven months, but nothing has blown up yet.

Perhaps Nippondenso publishes a specification you can
use to make a selection. After all, it's really to
compressor you are lubricating.