when to pull the plug??
Yep, I think its junk also.
I had a oil less compressor and I will never ever buy one again. It didnt last a year. I couldnt get warranty on it and the repair parts where to buy a new compressor assembly. They didnt sell the teflon rings. That assembly was as much as the compressor was new. From that point forward I will only buy compressors with oil in them.