What I am refering to is the external temp. of the engine. The water in the radiator can be cool but the external heat of the engine is very high. Example: After making a run with the 230 the water temp. would be at 190 but you could not hold your hand on the oil pan . I also noticed on my son's 308 that even the fan blades were hot. He is in the process of building a 308 and we have been discussing this issue. Presently talking about using an oil cooler instead of an oil filter or both. The tractor already uses a 6 blade fan but most vehicles only use the 4 blade fan. I don't know if this is an issue or not, because flatties have been running a long time as they came from the factory. Saw one at an auction this weekend in an air compressor and it ran like a sewing machine.