I'm looking at a toterhome that a guy has for sale. The chassis is a 72 with an 86 cab on it. He told me that the engine is a naturally aspirated 6-71 six cylinder Detroit diesel. From my research so far, the 6-71 is a two stroke engine and likes to make its power with high rpm's. Because they're two stroke, do they need any special treatment with the fuel or not? I've also been led to believe that they have a supercharger if they don't have a turbo (not completely sure on that one though). I've also seen that Detroits (not just the 6-71) are notorious for leaking oil. That's pretty much all that I've dug up on my own. I was wondering if there's any more details about the 6-71 that I should look into? The current owner doesn't know exactly how many miles are on the truck because the odometer has been broken ever since he bought it. He says it has no leaks aside from a small power steering leak. He also told me that it can't go over 70 mph with the 9 speed in it but it will pull anything. Here's a picture of the truck that I'm referring to. Any help is greatly appreciated.