Originally Posted by
7milesout
Well, that doesn't sound unreasonable to me. I just drained my oil at a 7,500 mile interval, and same as above. The oil level was still at the top. The oil didn't look "clean" like new oil, but it looked like it was carrying a very manageable amount of suspended particles and looked quite healthy. A 7,500 mile oci on mostly suburban driving doesn't concern me the least. It's probably overkill, but I'll stick to the manufacturer's recommendation.
So, with some explanation from minibishi2, I think he seems to be aware of what he's doing, and I doubt he's doing any engine killing harm. More power to him!
However mb2, Fummins knows his stuff. I'm betting his reply is based on various others that have posted same or similar things as you, but didn't follow up or explain their rationale. He B OK.