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I have to admit to using it in a pinch.I do feel TNT oil is different.Slightly lighter in viscosity,Older Mercs and Mercruisers called for 10w30 motor oil.
Yep...Thats where i'm at right now, in a pinch. The system has a small leak tha I need to repair in the near future. If 10w30 is closer to spec I have that too. :=