Thanks fellows for the great replies. I have been feeding my 3 Magnums 10w-30 most often because I had it handy. I have noticed that the main mower tractor (the one with the heaviest workload) requires frequent checks and topping off of the engine oil. I know the tractor gets real hot after mowing for an hour so, I give it time to cool off before starting back at it. When I say hot I mean you will burn your hand touching the grill shell or the front 1/3 of the hood. I don't know if that is common to the 1872 but I feel a little guilty I haven't cleaned behind the tins and wonder if clogged fins and air ways around the air cooled engine might account for the high temperatures.
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