Gast sub models

[mudr]

I just finished my first tubing system and look forward to not having to collect 125 taps manually after work. I don't have plans for vacuum this year, but am keeping my eyes open for equipment. I got a bender 1800 releaser (the big jar) on ebay for $50, now I need a pump. Looking at gast 1550s, and there are a few on ebay. My concern is buying a used 1550 that is not set up with the oil equipment and assuming it is oil less when it is actually and oiled model, and then ruining it. How do you interpret the full model numbers to determine oiled vs oil less?

Also, if I look at 2565s, can those be run on a 3 hp gas motor?

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