I'm closing in on my 6500 mile OCI with gold GC, and I've got about 1000 miles left. I just put my last bit of GC into the car, so far it's used 1 3/4 quart. I might need another 1/2 quart or less in the next 1000 miles. I don't have any GC left, but I do have 3 quarts of GTX HM 5w30. Would it be morally acceptable to add some GTX HM if I needed it? If you people here find that idea to be a cardinal sin then I suppose I could haul my butt to Walmart and buy another quart of GC if I have to. PS: Love the new forum setup!