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Location: Altoona IA | Agree with VMS. I have experienced both situations. Two strokes are classically dirty engines and not all oil is burnt. As time passes oil builds up in the mid-section especially if you mix heavy or are idling for long periods at a time (oil injected). When the motor is in the water, there is water in your mid-section up to what ever level it is on the boat. When you pull out and tilt up the motor (assuming) you trap a small amount of water in the midsection. The small holes are there to drain the mid. As you go down the road the wind blows this oily water on your transom. However, I wouldn't always assume it's build up. I have seen where it continues to weep oil (much cleaner and green) from the hole while in the driveway. Usually a hot summer day as the oil expands in the lower unit. This indicates bad seal. Usually a shift shaft seal. I agree with VMS on switching to a synthetic. That solved my problem with the residue in my midsection on my older 225 Merc that I run stupid amounts of fuel thru. If it continues after that or you want some peace of mind, the best bet would be to have the lower unit pressure checked. Usually under $50. | |
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