Oil & Fuel Motor Oil leakage, 3215

[Sergei]

My 2615, same engine as yours, has had a minor leak for the past 15 years. But not enough to go to the trouble of dropping the pan. I don't believe your oil pan has a gasket. Mine doesn't. My dealer told me, when I do decide to drop the pan, use black RTV as a sealant.
Permatex(R) Ultra Black(R) Maximum Oil Resistance RTV Silicone Gasket Maker - Permatex

Your 2615 tractor has a different engine size, still made by Mitsubishi but I couldn't find a gasket in the parts listing in either gasket kit or oil pan pictures. The 2815/3215 has a 1.5L S3L3 while yours has a 1.3L S3L2.
Just looked again at the breakdown of the gasket kit and item number 20 which points to the oil pan has a part # of TEMP723, but the description list it as Housing pinion, my guess its the sealant or no part number available as it appears in a lot of different breakdowns.