Last flea market of the year was last Saturday, so I went looking for a McCulloch SP 125. I did not find one. I did however find a deal on Stihl High Performance 2 cycle oil. They are the 12.8 ounce jugs. Anyhow, I bought all 15 of them for $35. All are sealed , but look they have been around awhile. No labels are legible except the Stihl stamp on the bottle. I have heard the shelf life of 2 cycle oil is indefinate, but have also read that 5 years is max. Would you guys trust it?