We are a car wash where the environment has a high level of moisture in the air, and where are compressors run not stop during our peak seasons. We switched to RARUS 827 over a year ago based on the recommendation of our compressor maintenance company.
I use it for my 5hp compressors that run almost continuously in the winter. There are cheaper air compressor oils that maybe would work, but I'm afraid to use those since my compressors are used so hard. I don't really have much to compare it to.
Do note that the container is not as shown. It comes in a silver metal can, not a red plastic pail. Not that it matters to me.
I buy one or two a year.
Ordered it for a scuba compressor, didn't need the 5 gallon but, couldn't find smaller container.