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Air compressor oil

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Dave

03-09-1999 19:24:10




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What type of oil should be used in a air compressor. Detergent? Multi-viscosity? weight?




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Doug Spalding

03-12-1999 02:12:09




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 Re: Air compressor oil in reply to Dave, 03-09-1999 19:24:10  
You don't say where you live. If your compressor is kept outside in cold weather, you will find synthetic oil will make a big difference in starting. I use Mobil-1 5-30 with good results.



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Wild Bill

03-09-1999 20:28:36




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 Re: Air compressor oil in reply to Dave, 03-09-1999 19:24:10  
I use 20w20 in my little 3hp Craftsman, mainly 'cause that's what the manual said to use. I keep it full and change it once a year. It's about 12 years old, no problems so far.



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Bob

03-09-1999 20:08:53




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 Re: Air compressor oil in reply to Dave, 03-09-1999 19:24:10  

Definately non detergent.I run 20 wt. in mine. Some mfg. want 30 wt.,but not many.I also use oil made for air compressors,I know you can get arguements for using regular non detergent oil,but I found air compressor oil is more transparent than motor oil.When I change my oil,I can see if I'm getting any shavings or contaminates in the compressor.



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jim

03-13-1999 00:21:23




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 Re: Re: Air compressor oil in reply to Bob, 03-09-1999 20:08:53  
sae30w non detergent .I have been using Kendal for years. Also use to to lub. air tools.



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Roger Prosper

07-23-1999 11:41:01




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 Re: Re: Re: Air compressor oil in reply to jim, 03-13-1999 00:21:23  
Avoid all types of multigrade motor oils. Shell Corena is the best type of oil I have ever seen for reciprocating compressor use. When the rings get weak on an air compressor, or when natural oil blow by from the crankcase reaches the valves, it can burn if it gets too hot up there. Corena will lightly ash under such conditions, but multigrade oils of any type will turn to something resembling charcoal. This will lead to valves sticking open, poor air flow and severe and rapid overheating, causing a snowball effect leading to other mechanical woes. I've taken apart Quincy 325 air compressors used on oil drilling platforms where they threw in the 15w40 they used for their Detroit v12's. I had to hammer them out because there was so much glass like carbon build up in the heads! The only problem with Corena is its availability in small amounts (5 gal buckets was the norm where I worked). Perhaps a compressor shop in the area has some you could buy by the gallon? It comes from 32 to 122 grades. Lighter for cold, heavier for hot. Interestingly, DeVilbiss only recommended 30W even in their heaviest duty 445 and 447 compressors, under the hottest conditions. Lighter oil gets up to the wristpins sooner upon startup than a heavier oil . Wristpins were a sore point on these machines.

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