Put the oil in a cast iron skillet, salt and pepper roast, and brown over medium heat, turning to brown all sides of roast.
Remove roast to a platter and turn heat to low.
In same skillet, mix together soup, dry onion soup mix, and water. Stir to mix and get browned bits off the bottom (this is the good stuff :)).
Pour ½ mixture from skillet into the crockpot, then lay roast in.
Pour remaining mixture from skillet over the top of roast.
Arrange potatoes around the roast.
Cover and cook on low for 6 to 8 hours or until roast falls apart and potatoes are tender.