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I have a good customer who is in the food industry, and has flash freezers that go to -40 deg. F.
They use two different types, both food grade (H-1). For the flash freezers, they use CHevron Tegra synthetic compressor oil, ISO 68. The main problem they have is water ingress, which destroys the gearbox before anything else has a chance to. Seems the sanitation department like to have the sprays right on the shaft of the gearbox underneath the drive cogs.

For the coolers, which are at 0 deg. F, they use the manufacturers product, which is a Frigo oil from Frigoscandia (JBT). FRIGO 410, LOW TEMP, part no. 350945C.

Dave
RM
In my days with a major gear OEM I did some research on gearbox lubrication at temps like -40 F. This was being done as we were supplying gearboxes for the Alaska pipeline.

The products we finally decided on were the Mobil SHC series. The SHC is for synthesized hydrocarbon. Usually we picked something a grade or two less viscous for drives that were outdoors. What you want to do is minimize or eliminate what is termed channeling. This is when the lubricant turns solid and the gears when they rotate literally cut a channel in the solid lubricant.

John from PA
RM

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