I have a leak in one of my rear storage compartments around the drain hole in my 2006 Puma. My question is does the bulkhead fittng unscrews or is this fitting glued. It appears the silicone sealant around drain is where the leak is coming from. Also I am running a 225 E-Tec and running the XD-50 oil, does anyone know of another brand of oil that meets the specifications of Evinrude. At $32.00 a gallon here in Cincinnati it is getting little expensive.