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Compressor oil grade

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guest23837:
I was at the tyre shop today and I noticed he had a 50l compressor sitting in the office. A few words €20 changed hands and I have it. He said the motor was working so I took the head off cleaned the reed valves and I have a €20 compressor. The oil was black and thin so it's been drained. My question is can I use car engine oil? I have 10W40 semi synthetic and 5W30 synthetic oil in the shed. I could give the local parts guy €10 for 500 mil of compressor oil but I'd hate to do it if I didn't have to. The compressor is Bergin branded so likely Chinese. Any ideas?

38ac:
 Not familiar with that brand but if it is recipricating (piston and crankshaft) compressor I used 10w 30 motor oil for 50 years before I read on the internet that it could not be used. Thus I ran out to the shop and drained it real quick before my compressor went up in flames!!!😁

   it is best to use non detergent if one is going to buy the oil anyway but since you have the other on the shelf Id dump it in and fret it not one little bit.  Lubricating a compressor is far from rocket science.

guest23837:
Thanks guys! I'll go with the 5w30 it's turbodiesel oil. Glort I like your logic!

38ac:
 Some of the experts on the internet really make me laugh. Read once that engine oil could not be used as it was not designed to take the heat generated by an air compressor ::)
As said the multi grade woukd be beneficial for starting up.

mikenash:
Probably because there a many kinds of compressors?

The expensive modern screw ones that have a mix of compressed air and oil mist and which catch the oil "on the way out" with a separator are fussy buggers, expensive to maintain, unforgiving if not maintained properly, and extra expensive when they blow up.

With one of them, using the right oil is a must IMHO

It's probably folks thinking about them that are finicky about the oil

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