In my 94 Toyota Corolla. Since it only holds 3.9 quarts of oil, I just split the bottle in half and will do 2 750-1000 mile treatments with 6 oz each. Sound like a good plan? I will be cutting open my filter on the first treatment to see what kinda crud comes out. The motor is pretty sludgy from a visual inspection through the oil filler neck on the valve cover. Hopefully the double treatment at a little less than the recomended 2 oz/quart will do the trick