I purchase the this on AliExpress (china's amazon) and it was LOT 5 M27x1.5mm sight oil. You can buy this at ebay, but you spend like $1 more.
I recommend that you buy 2 o-rings, cuss the 1 o-ring is like 1mm too thin. It was leaking oil, so i added another o-ring to solve the problem. Now after like 4 months, it does not leak oil.
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