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The 1990 would be easier as it is not innercooled. As low as the M1009 is geared, I doubt exhaust gas temperatures would ever be an issue anyway. Those aircraft tugs are kind of cool. One thing is for sure, it will not have been over worked. They had super low gears in those things.

You can also overfill it through one of the upper power take off bolt holes. That is where I top off or refill mine at. Glen