The different synthetics can also contain different additive packages that can clean different things. I ran Mobil 1 since I got mine (switched at 77K), and didnt lose any. Ran that until, IIRC, 125K, when I followed one of my co-worker's advice and tried Royal Purple. I had gotten fairly lax at checking the level because it would never drop. 3K later when I went to change it I was shocked to find I was a quart (!) low. 3K later it hadnt moved. Strange.
That was the only time it has ever burnt it too. Even with close to 6700 on this change, I only had to add 2oz between fill and drain.
Anyway, back to Jose's car. Interior pics?
