I have been using LP-20 and have noticed my oil is cleaner well past the OCI. It is now approaching 2X the interval which is 3,750, and it is just beginning to turn medium brown on the stick. I wiped the stick on a clean cloth and the stain is a light nutty brown. I have not had to add a single drop in this entire interval - now 6K+. The oil feels and smells right. No gas dilution. It appears to me the oil is fine. I was planning to go to 7.5K but noticed that it was recommended by LCD to go to 10K. Based on what I see, I have no reason to doubt this. My oil has always turned a very dark brown to blackby 3,750 and I've always had to add a half quart. The question I have is this consistent with the experience of those who use this product? If so, I think I'll go to 10K if the oil looks right. Many thanks for any input. (I recognize the correct way to make this assessment is with an UOA but I'm looking for experiencial data).