The owner's manual lists the engine capacity at 7.5 qts with filter change. I always just dump in two gallons. I too keep the engine a little over full. The higher level helps the engine get oil pressure more quickly on startup. Less run time without oil pressure is less engine wear!
As for winter weather start up rattle??? Ha ha mine sounds like a rock tumbler going ouside, and thats running 5w-40! I can't immagine this thing running with 15w-40 at 15 or 20 degrees!
Jason
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