I have a 3 cyl. Universal diesel in my 1982 Allman 31. I am trying to determine the model number. Previous owner is no help. I think it may be an M25 or maybe an M30. Internet search says the model number is on the exhaust manifold, but I have not been able to find it. Anyone have an idea or trick to ID this? I will be needing to get oil and fuel filters soon. (by the way, it starts and runs great)