I just bought a radial 4 compressor mod T58235. I took the double plug off the back and drained the 3oz oil. It came with no paperwork telling me how much oil to replace that oil with, no labels or marks to let me know what brand or model it is. There is a gold plug on the back with a green center in it. Is that where i pour the new oil in it or should i pour it in the hose holes on back. How much oil and where to add it. Any help is appreciated.

I'm assuming this is for the 1986 C-10 with the 305 or 350:


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. . . right?
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I'm guessing your "T58235" is the same as RockAuto'* "Four Seasons 58235"



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If so, I see two references referring to being pre-filled with oil:
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. . . then I see:
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I attached the capacity guide to this post for reference.
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On page 29, I see:
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If it were me, I wouldn't drain the oil that came with it, and then I would add what is needed to meet the specification.

thanks for showing the total amount.I bought a new compressor and did like their instructions said and drained the oil that was sent in it. The oil was dark grey almost black and when it settled in the drain pan over night it was covered in silver powder in bottom of pan. plus it was only 2 1/4 oz of oil. Bought as NEW but it came with no labels or marks on it telling what brand it was, the box said made in mexico. I returned it. Wouldn't that been something if i hadn't drained and measured the oil that came with it. I need to know where to put the new oil into the compressor. in the hose openings i drained it out of or is that gold colored nut a fill hole? Thanks for the response.

Where did you buy this from?

parts g--k

Do you or anyone out there ,know where I add the new oil? H

Here is a pic of the oil that came out of their NEW compressor. (made in mexico)

parts g--k. I am sending a pic of the oil i drained out of the NEW compressor they sent me. (compressor is made in mexico and had no lables or markings to tell me what brand it was.I paid for a AC Delco.

I add to the low pressure side, then turn the clutch at least ten turns the same way it will rotate when installed, then reinstall the dust caps until it is installed and I'm ready to connect the hoses.

ACDelco is 1521764 and ~62% more expensive.

If you paid for ACDelco and it isn't an ACDelco, send it back.